http://icct.kma.zcu.cz/api.php?action=feedcontributions&user=Pendl&feedformat=atomIcctwiki - User contributions [en]2023-09-27T14:58:26ZUser contributionsMediaWiki 1.30.0http://icct.kma.zcu.cz/index.php?title=Study_groups&diff=608Study groups2020-06-11T12:06:03Z<p>Pendl: </p>
<hr />
<div>==Joint Study Groups==<br />
<br />
[[JSG T.23|'''JSG T.23: Spherical and spheroidal integral formulas of the potential theory for transforming classical and new gravitational observables''']]<br><br />
Chair: ''Michal Šprlák (Czech Republic)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG T.24|'''JSG T.24: Integration and co-location of space geodetic observations and parameters''']]<br><br />
Chair: ''Krsyzstof Sośnica (Poland)''<br><br />
Affiliation: ''Commissions 1, 2, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.25|'''JSG T.25: Combining geodetic and geophysical information for probing Earth’s inner structure and its dynamics''']]<br><br />
Chairs: ''Robert Tenzer (Hong Kong)''<br><br />
Affiliation: ''Commissions 2 and 3, GGOS''<br><br />
<br />
[[JSG T.26|'''JSG T.26: Geoid/quasi-geoid modelling for realization of the geopotential height datum''']]<br><br />
Chair: ''Jianliang Huang (Canada)''<br><br />
Affiliation: '' Commission 2 and GGOS''<br><br />
<br />
[[JSG T.27|'''JSG T.27: Coupling processes between magnetosphere, thermosphere and ionosphere''']]<br><br />
Chair: ''Andres Calabia (China)''<br><br />
Affiliation: ''Commission 4 and GGOS''<br><br />
<br />
[[JSG T.28|'''JSG T.28: Forward gravity field modelling of known mass distributions''']]<br><br />
Chairs: ''Dimitrios Tsoulis (Greece)''<br><br />
Affiliation: ''Commissions 2 and 3, GGOS''<br><br />
<br />
[[JSG T.29|'''JSG T.29: Machine learning in geodesy''']]<br><br />
Chairs: ''Benedikt Soja (Switzerland)''<br><br />
Affiliation: ''Commissions 2, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.30|'''JSG T.30: Dynamic modelling of deformation, rotation and gravity field variations''']]<br><br />
Chair: ''Yoshiyuki Tanaka (Japan)''<br><br />
Affiliation: ''Commissions 2 and 3, GGOS''<br><br />
<br />
[[JSG T.31|'''JSG T.31: Multi-GNSS theory and algorithms''']]<br><br />
Chair: ''Amir Khodabandeh (Australia)''<br><br />
Affiliation: ''Commissions 1 and 4, GGOS''<br><br />
<br />
[[JSG T.32|'''JSG T.32: High-rate GNSS for geoscience and mobility''']]<br><br />
Chair: ''Mattia Crespi (Italy)''<br><br />
Affiliation: ''Commissions 1, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.33|'''JSG T.33: Time series analysis in geodesy and geodynamics''']]<br><br />
Chair: ''Wieslaw Kosek (Poland)''<br><br />
Affiliation: ''Commissions 1, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.34|'''JSG T.34: High resolution harmonic analysis and synthesis of potential fields''']]<br><br />
Chair: ''Sten Claessens (Australia) Yoshiyuki Tanaka (Japan)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG T.35|'''JSG T.35: Advanced numerical methods in physical geodesy''']]<br><br />
Chair: ''Robert Čunderlík (Slovakia)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG T.36|'''JSG T.36: Dense troposphere and ionosphere sounding''']]<br><br />
Chair: ''Giorgio Savastano (Luxembourg)''<br><br />
Affiliation: ''Commission 4 and GGOS''<br><br />
<br />
[[JSG T.37|'''JSG T.37: Theory and methods related to combination of high-resolution topographic/bathymetric models in geodesy''']]<br><br />
Chair: ''Daniela Carrion (Italy)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br></div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Study_groups&diff=607Study groups2020-06-11T12:05:36Z<p>Pendl: </p>
<hr />
<div>==Joint Study Groups==<br />
<br />
[[JSG T.23|'''JSG T.23: Spherical and spheroidal integral formulas of the potential theory for transforming classical and new gravitational observables''']]<br><br />
Chair: ''Michal Šprlák (Czech Republic)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG T.24|'''JSG T.24: Integration and co-location of space geodetic observations and parameters''']]<br><br />
Chair: ''Krsyzstof Sośnica (Poland)''<br><br />
Affiliation: ''Commissions 1, 2, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.25|'''JSG T.25: Combining geodetic and geophysical information for probing Earth’s inner structure and its dynamics''']]<br><br />
Chairs: ''Robert Tenzer (Hong Kong)''<br><br />
Affiliation: ''Commissions 2 and 3, GGOS''<br><br />
<br />
[[JSG T.26|'''JSG T.26: Geoid/quasi-geoid modelling for realization of the geopotential height datum''']]<br><br />
Chair: ''Jianliang Huang (Canada)''<br><br />
Affiliation: '' Commission 2 and GGOS''<br><br />
<br />
[[JSG T.27|'''JSG T.27: Coupling processes between magnetosphere, thermosphere and ionosphere''']]<br><br />
Chair: ''Andres Calabia (China)''<br><br />
Affiliation: ''Commission 4 and GGOS''<br><br />
<br />
[[JSG T.28|'''JSG T.28: Forward gravity field modelling of known mass distributions''']]<br><br />
Chairs: ''Dimitrios Tsoulis (Greece)''<br><br />
Affiliation: ''Commissions 2 and 3, GGOS''<br><br />
<br />
[[JSG T.29|'''JSG T.29: Machine learning in geodesy''']]<br><br />
Chairs: ''Benedikt Soja (Switzerland)''<br><br />
Affiliation: ''Commissions 2, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.30|'''JSG T.30: Dynamic modelling of deformation, rotation and gravity field variations''']]<br><br />
Chair: ''Yoshiyuki Tanaka (Japan)''<br><br />
Affiliation: ''Commissions 2 and 3, GGOS''<br><br />
<br />
[[JSG T.31|'''JSG T.31: Multi-GNSS theory and algorithms''']]<br><br />
Chair: ''Amir Khodabandeh (Australia)''<br><br />
Affiliation: ''Commissions 1 and 4, GGOS''<br><br />
<br />
[[JSG T.32|'''JSG T.32: High-rate GNSS for geoscience and mobility''']]<br><br />
Chair: ''Mattia Crespi (Italy)''<br><br />
Affiliation: ''Commissions 1, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.33|'''JSG T.33: Time series analysis in geodesy and geodynamics''']]<br><br />
Chair: ''Wieslaw Kosek (Poland)''<br><br />
Affiliation: ''Commissions 1, 3 and 4, GGOS''<br><br />
<br />
[[JSG T.34|'''JSG T.34: High resolution harmonic analysis and synthesis of potential fields''']]<br><br />
Chair: ''Sten Claessens (Australia) Yoshiyuki Tanaka (Japan)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG0 T.35|'''JSG T.35: Advanced numerical methods in physical geodesy''']]<br><br />
Chair: ''Robert Čunderlík (Slovakia)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG T.36|'''JSG T.36: Dense troposphere and ionosphere sounding''']]<br><br />
Chair: ''Giorgio Savastano (Luxembourg)''<br><br />
Affiliation: ''Commission 4 and GGOS''<br><br />
<br />
[[JSG T.37|'''JSG T.37: Theory and methods related to combination of high-resolution topographic/bathymetric models in geodesy''']]<br><br />
Chair: ''Daniela Carrion (Italy)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br></div>Pendlhttp://icct.kma.zcu.cz/index.php?title=MediaWiki:Sidebar&diff=558MediaWiki:Sidebar2020-06-02T08:40:50Z<p>Pendl: </p>
<hr />
<div>* Main menu<br />
** mainpage|Main page<br />
** Organization|Organization<br />
** Vision|Vision and objectives<br />
** Steering commitee<br />
** Study_groups|Joint study groups<br />
** Logo|Our Logo<br />
** Links|Links<br />
** News|News<br />
** Announcements|Hotine-Marussi 2009<br />
** HM2013|Hotine-Marussi 2013<br />
** Hotine-Marussi_2018|Hotine-Marussi 2018<br />
** Mid-term_report_2007-09|Mid-term report 2007-09<br />
** Final_report_2007-11|Final report 2007-11<br />
** Mid-term_report_2011-13|Mid-term report 2011-13<br />
** Final_report_2011-15|Final report 2011-15<br />
** Mid-term_report 2015-17|Mid-term report 2015-17<br />
** Final_report_2015-19|Final report 2015-19<br />
** Forum|Forum<br />
<br />
* Joint study groups<br />
** JSG0.10|Joint study group T.23<br />
** JSG0.11|Joint study group T.24<br />
** JSG0.12|Joint study group T.25<br />
** JSG0.13|Joint study group T.26<br />
** JSG0.14|Joint study group T.27<br />
** JSG0.15|Joint study group T.28<br />
** JSG0.16|Joint study group T.29<br />
** JSG0.17|Joint study group T.30<br />
** JSG0.18|Joint study group T.31<br />
** JSG0.19|Joint study group T.32<br />
** JSG0.20|Joint study group T.33<br />
** JSG0.21|Joint study group T.34<br />
** JSG0.22|Joint study group T.35<br />
** JSG T.36|Joint study group T.36<br />
** JSG T.37|Joint study group T.37</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=MediaWiki:Sidebar&diff=557MediaWiki:Sidebar2020-06-02T08:40:36Z<p>Pendl: </p>
<hr />
<div>* Main menu<br />
** mainpage|Main page<br />
** Organization|Organization<br />
** Vision|Vision and objectives<br />
** Steering commitee<br />
** Study_groups|Joint study groups<br />
** Logo|Our Logo<br />
** Links|Links<br />
** News|News<br />
** Announcements|Hotine-Marussi 2009<br />
** HM2013|Hotine-Marussi 2013<br />
** Hotine-Marussi_2018|Hotine-Marussi 2018<br />
** Mid-term_report_2007-09|Mid-term report 2007-09<br />
** Final_report_2007-11|Final report 2007-11<br />
** Mid-term_report_2011-13|Mid-term report 2011-13<br />
** Final_report_2011-15|Final report 2011-15<br />
** Mid-term_report 2015-17|Mid-term report 2015-17<br />
** Final_report_2015-19|Final report 2015-19<br />
** Forum|Forum<br />
<br />
* Joint study groups<br />
** JSG0.10|Joint study group T.23<br />
** JSG0.11|Joint study group T.24<br />
** JSG0.12|Joint study group T.25<br />
** JSG0.13|Joint study group T.26<br />
** JSG0.14|Joint study group T.27<br />
** JSG0.15|Joint study group T.28<br />
** JSG0.16|Joint study group T.29<br />
** JSG0.17|Joint study group T.30<br />
** JSG0.18|Joint study group T.31<br />
** JSG0.19|Joint study group T.32<br />
** JSG0.20|Joint study group T.33<br />
** JSG0.21|Joint study group T.34<br />
** JSG0.22|Joint study group T.35<br />
** JSG T.36|Joint study group T.36<br />
** JSG T.37|Joint study group T.37<br />
<br />
* Tools</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Final_report_2011-15&diff=556Final report 2011-152020-06-01T10:01:47Z<p>Pendl: </p>
<hr />
<div>The Final Report of the Inter-Commission Committee on Theory of the International Association of Geodesy covering the period 2011-15 can be downloaded [[Media:ICCT_Final_Report_2011-2015.pdf|here]].</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=File:Final_Report_ICCT_2015-19.pdf&diff=555File:Final Report ICCT 2015-19.pdf2020-06-01T09:58:52Z<p>Pendl: </p>
<hr />
<div></div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Final_report_2011-15&diff=554Final report 2011-152020-06-01T09:50:31Z<p>Pendl: </p>
<hr />
<div>The Final Report of the Inter-Commission Committee on Theory of the International Association of Geodesy covering the period 2011-15 can be downloaded [[Special:Redirect/images/1/19/Final_Report_ICCT_2015-19.pdf|here]].</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Final_report_2011-15&diff=553Final report 2011-152020-06-01T09:48:28Z<p>Pendl: </p>
<hr />
<div>The Final Report of the Inter-Commission Committee on Theory of the International Association of Geodesy covering the period 2011-15 can be downloaded [[http://icct.kma.zcu.cz/images/1/19/Final_Report_ICCT_2015-19.pdf |here]].</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Final_report_2011-15&diff=552Final report 2011-152020-06-01T09:48:06Z<p>Pendl: </p>
<hr />
<div>The Final Report of the Inter-Commission Committee on Theory of the International Association of Geodesy covering the period 2011-15 can be downloaded [[http://icct.kma.zcu.cz/images/1/19/Final_Report_ICCT_2015-19.pdf|here]].</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Final_report_2011-15&diff=551Final report 2011-152020-06-01T09:47:46Z<p>Pendl: </p>
<hr />
<div>The Final Report of the Inter-Commission Committee on Theory of the International Association of Geodesy covering the period 2011-15 can be downloaded [[Media:http://icct.kma.zcu.cz/images/1/19/Final_Report_ICCT_2015-19.pdf|here]].</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Final_report_2015-19&diff=550Final report 2015-192020-06-01T09:27:56Z<p>Pendl: </p>
<hr />
<div>The Final Report of the Inter-Commission Committee on Theory of the International Association of Geodesy covering the period 2015-19 can be downloaded [[Media:Final_Report_ICCT_2015-19.pdf|here]].</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Study_groups&diff=549Study groups2020-06-01T09:26:02Z<p>Pendl: /* Joint Study Groups */</p>
<hr />
<div>==Joint Study Groups==<br />
<br />
<br />
[[JSG0.10|'''JSG T.23: High-rate GNSS''']]<br><br />
Chair: ''Mattia Crespi (Italy)''<br><br />
Affiliation: ''1, 3 and 4''<br><br />
<br />
[[JSG0.11|'''JSG T.24: : Multiresolutional aspects of potential field theory''']]<br><br />
Chair: ''Dimitrios Tsoulis (Greece)''<br><br />
Affiliation: ''Commissions 2, 3 and GGOS''<br><br />
<br />
[[JSG0.12|'''JSG T.25: Advanced computational methods for recovery of high-resolution gravity field models''']]<br><br />
Chairs: ''Robert Čunderlík (Slovakia)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG0.13|'''JSG T.26: Integral equations of potential theory for continuation and transformation of classical and new gravitational observables''']]<br><br />
Chair: ''Michal Šprlák (Czech Republic)''<br><br />
Affiliation: '' Commission 2 and GGOS''<br><br />
<br />
[[JSG0.14|'''JSG T.27: Fusion of multi-technique satellite geodetic data''']]<br><br />
Chair: ''Krsyzstof Sośnica (Poland)''<br><br />
Affiliation: ''All commissions and GGOS''<br><br />
<br />
[[JSG0.15|'''JSG T.28: Regional geoid/quasi-geoid modelling – Theoretical framework for the sub-centimetre accuracy''']]<br><br />
Chairs: ''Jianliang Huang (Canada)''<br><br />
Affiliation: ''Commission 2''<br><br />
<br />
[[JSG0.16|'''JSG T.29: Earth’s inner structure from combined geodetic and geophysical sources''']]<br><br />
Chairs: ''Robert Tenzer (China)''<br><br />
Affiliation: ''Commissions 2, 3 and GGOS''<br><br />
<br />
[[JSG0.17|'''JSG T.30: Multi-GNSS theory and algorithms''']]<br><br />
Chair: ''Amir Khodabandeh (Australia)''<br><br />
Affiliation: ''Commissions 1, 4 and GGOS''<br><br />
<br />
[[JSG0.18|'''JSG T.31: High resolution harmonic analysis and synthesis of potential fields''']]<br><br />
Chair: ''Sten Claessens (Australia)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG0.19|'''JSG T.32: Time series analysis in geodesy''']]<br><br />
Chair: ''Wieslaw Kosek (Poland)''<br><br />
Affiliation: ''Commission 3 and GGOS''<br><br />
<br />
[[JSG0.20|'''JSG T.33: Space weather and ionosphere''']]<br><br />
Chair: ''Klaus Börger (Germany)''<br><br />
Affiliation: ''Commissions 1, 4 and GGOS''<br><br />
<br />
[[JSG0.21|'''JSG T.34: Geophysical modelling of time variations in deformation and gravity''']]<br><br />
Chair: ''Yoshiyuki Tanaka (Japan) ''<br><br />
Affiliation: ''Commissions 2 and 3''<br><br />
<br />
[[JSG0.22|'''JSG T.35: Definition of next generation terrestrial reference frames''']]<br><br />
Chair: ''Christopher Kotsakis (Greece)''<br><br />
Affiliation: ''Commission 1 and GGOS''<br><br />
<br />
[[JSG T.36|'''JSG T.36: XXX''']]<br><br />
Chair: ''XXX''<br><br />
Affiliation: ''XXX''<br><br />
<br />
[[JSG T.37|'''JSG T.37: XXX''']]<br><br />
Chair: ''XXX''<br><br />
Affiliation: ''XXX''<br></div>Pendlhttp://icct.kma.zcu.cz/index.php?title=Study_groups&diff=548Study groups2020-06-01T09:25:24Z<p>Pendl: /* Joint Study Groups */</p>
<hr />
<div>==Joint Study Groups==<br />
<br />
<br />
[[JSG0.10|'''JSG T.23: High-rate GNSS''']]<br><br />
Chair: ''Mattia Crespi (Italy)''<br><br />
Affiliation: ''1, 3 and 4''<br><br />
<br />
[[JSG0.11|'''JSG T.24: : Multiresolutional aspects of potential field theory''']]<br><br />
Chair: ''Dimitrios Tsoulis (Greece)''<br><br />
Affiliation: ''Commissions 2, 3 and GGOS''<br><br />
<br />
[[JSG0.12|'''JSG T.25: Advanced computational methods for recovery of high-resolution gravity field models''']]<br><br />
Chairs: ''Robert Čunderlík (Slovakia)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG0.13|'''JSG T.26: Integral equations of potential theory for continuation and transformation of classical and new gravitational observables''']]<br><br />
Chair: ''Michal Šprlák (Czech Republic)''<br><br />
Affiliation: '' Commission 2 and GGOS''<br><br />
<br />
[[JSG0.14|'''JSG T.27: Fusion of multi-technique satellite geodetic data''']]<br><br />
Chair: ''Krsyzstof Sośnica (Poland)''<br><br />
Affiliation: ''All commissions and GGOS''<br><br />
<br />
[[JSG0.15|'''JSG T.28: Regional geoid/quasi-geoid modelling – Theoretical framework for the sub-centimetre accuracy''']]<br><br />
Chairs: ''Jianliang Huang (Canada)''<br><br />
Affiliation: ''Commission 2''<br><br />
<br />
[[JSG0.16|'''JSG T.29: Earth’s inner structure from combined geodetic and geophysical sources''']]<br><br />
Chairs: ''Robert Tenzer (China)''<br><br />
Affiliation: ''Commissions 2, 3 and GGOS''<br><br />
<br />
[[JSG0.17|'''JSG T.30: Multi-GNSS theory and algorithms''']]<br><br />
Chair: ''Amir Khodabandeh (Australia)''<br><br />
Affiliation: ''Commissions 1, 4 and GGOS''<br><br />
<br />
[[JSG0.18|'''JSG T.31: High resolution harmonic analysis and synthesis of potential fields''']]<br><br />
Chair: ''Sten Claessens (Australia)''<br><br />
Affiliation: ''Commission 2 and GGOS''<br><br />
<br />
[[JSG0.19|'''JSG T.32: Time series analysis in geodesy''']]<br><br />
Chair: ''Wieslaw Kosek (Poland)''<br><br />
Affiliation: ''Commission 3 and GGOS''<br><br />
<br />
[[JSG0.20|'''JSG T.33: Space weather and ionosphere''']]<br><br />
Chair: ''Klaus Börger (Germany)''<br><br />
Affiliation: ''Commissions 1, 4 and GGOS''<br><br />
<br />
[[JSG0.21|'''JSG T.34: Geophysical modelling of time variations in deformation and gravity''']]<br><br />
Chair: ''Yoshiyuki Tanaka (Japan) ''<br><br />
Affiliation: ''Commissions 2 and 3''<br><br />
<br />
[[JSG0.22|'''JSG T.35: Definition of next generation terrestrial reference frames''']]<br><br />
Chair: ''Christopher Kotsakis (Greece)''<br><br />
Affiliation: ''Commission 1 and GGOS''<br><br />
<br />
[[JSG T.36|'''JSG T.36: XXX''']]<br><br />
Chair: ''XXX''<br><br />
Affiliation: ''XXX''<br></div>Pendlhttp://icct.kma.zcu.cz/index.php?title=MediaWiki:Sidebar&diff=547MediaWiki:Sidebar2020-06-01T09:21:08Z<p>Pendl: </p>
<hr />
<div>* Main menu<br />
** mainpage|Main page<br />
** Organization|Organization<br />
** Vision|Vision and objectives<br />
** Steering commitee<br />
** Study_groups|Joint study groups<br />
** Logo|Our Logo<br />
** Links|Links<br />
** News|News<br />
** Announcements|Hotine-Marussi 2009<br />
** HM2013|Hotine-Marussi 2013<br />
** Hotine-Marussi_2018|Hotine-Marussi 2018<br />
** Mid-term_report_2007-09|Mid-term report 2007-09<br />
** Final_report_2007-11|Final report 2007-11<br />
** Mid-term_report_2011-13|Mid-term report 2011-13<br />
** Final_report_2011-15|Final report 2011-15<br />
** Mid-term_report 2015-17|Mid-term report 2015-17<br />
** Final_report_2015-19|Final report 2015-19<br />
** Forum|Forum<br />
<br />
* Joint study groups<br />
** JSG0.10|Joint study group T.23<br />
** JSG0.11|Joint study group T.24<br />
** JSG0.12|Joint study group T.25<br />
** JSG0.13|Joint study group T.26<br />
** JSG0.14|Joint study group T.27<br />
** JSG0.15|Joint study group T.28<br />
** JSG0.16|Joint study group T.29<br />
** JSG0.17|Joint study group T.30<br />
** JSG0.18|Joint study group T.31<br />
** JSG0.19|Joint study group T.32<br />
** JSG0.20|Joint study group T.33<br />
** JSG0.21|Joint study group T.34<br />
** JSG0.22|Joint study group T.35<br />
** JSG T.36|Joint study group T.36<br />
** JSG T.37|Joint study group T.37<br />
<br />
* Tools<br />
** recentchanges-url|recentchanges<br />
** randompage-url|randompage<br />
** helppage|help</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.37&diff=546JSG T.372020-06-01T09:19:37Z<p>Pendl: Created page with "Test --JSG T.37--"</p>
<hr />
<div>Test --JSG T.37--</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.36&diff=545JSG T.362020-06-01T09:19:12Z<p>Pendl: Created page with "Test --JSG T.36--"</p>
<hr />
<div>Test --JSG T.36--</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.35&diff=543JSG T.352020-06-01T09:18:40Z<p>Pendl: Pendl moved page JSG0.22 to JSG T.35</p>
<hr />
<div><big>'''JSG T.35: Definition of next generation terrestrial reference frames'''</big><br />
<br />
Chair: ''Christopher Kotsakis (Greece)''<br><br />
Affiliation:''Comm. 1 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
A Terrestrial Reference Frame (TRF) is required for measuring the Earth orientation in space, for positioning objects at the Earth’s surface as well as satellites in orbit around the Earth, and for the analysis of geophysical processes and their spatiotemporal variations. TRFs are currently constructed by sets of tri-dimensional coordinates of ground stations, which implicitly realize the three orthogonal axes of the corresponding frame. To account for Earth’s deformations, these coordinates have been commonly modelled as piece-wise linear functions of time which are estimated from space geodetic data under various processing strategies, resulting to the usual type of geodetic frame solutions in terms of station coordinates (at some reference epoch) and constant velocities. Most recently, post-seismic deformation has been added as well in geodetic frame solutions. The requirements of the Earth science community for the accuracy level of such secular TRFs for present-day applications are in the order of 1 mm and 0.1 mm/year, which is not generally achievable at the present time. Improvements in data analysis models, coordinate variation models, optimal estimation procedures and datum definition choices (e.g. NNR conditions) should still be investigated in order to enhance the present positioning accuracy under the “linear” TRF framework. <br />
<br />
Moreover, the consideration of seasonal changes in the station positions due to the effect of geophysical loading signals and other complex tectonic motions has created an additional interest towards the development of “non-linear” TRFs aiming to provide highly accurate coordinates of the quasi-instantaneous positions in a global network. This approach overcomes the limitation of global secular frames which model the average positions over a long time span, yet it creates significant new challenges and open problems that need to be resolved to meet the aforementioned accuracy requirements.<br />
<br />
The above considerations provide the motivation for this JSG whose work will be focused to studying and improving the current approaches for the definition and realization of global TRFs from space geodetic data, in support of Earth mapping and monitoring applications. The principal aim is to identify the major issues causing the current internal/external accuracy limitations in global TRF solutions, and to investigate possible ways to overcome them either in the linear or the non-linear modeling framework.<br />
<br />
===Objectives===<br />
<br />
* To review and compare from the theoretical point of view the current approaches for the definition and realization of global TRFs, including data reduction strategies and frame estimation methodologies.<br />
* To evaluate the distortion caused by hidden datum information within the unconstrained normal equations (NEQs) to combination solutions by the “minimum constraints” approach, and to develop efficient tools enforcing the appropriate rank deficiency in input NEQs when computing TRF solutions.<br />
* To study the role of the 7/14-parameter Helmert transformation model in handling non-linear (non-secular) global frames, as well as to investigate the frame transformation problem in the presence of modeled seasonal variations in the respective coordinates.<br />
* To study theoretical and numerical aspects of the stacking problem, both at the NEQ level and at the coordinate time-series level, with unknown non-linear seasonal terms when estimating a global frame from space geodetic data.<br />
* To compare the aforementioned methodology with other alternative approaches in non-linear frame modeling, such as the computation of high-rate time series of global TRFs.<br />
* To investigate the modeling choices for the datum definition in global TRFs with particular emphasis on the frame orientation and the different types of no-net-rotation (NNR) conditions.<br />
<br />
===Program of activities===<br />
<br />
* Active participation at major geodetic meetings, promotion of related sessions at international scientific symposia and publication of important findings related to the JSG objectives.<br />
* Proposal for a state-of-art review paper in global frame theory, realization methodologies and open problems, co-authored by the JSG members.<br />
* Organize a related session at the forthcoming Hotine-Marussi Symposium.<br />
* Launching a web page with emphasis on exchange of research ideas, recent results, updated bibliographic list of references and relevant publications from other disciplines.<br />
<br />
===Membership===<br />
<br />
'' '''Christopher Kotsakis (Greece), chair''' <br /> Zuheir Altamimi (France) <br /> Michael Bevis (USA) <br /> Mathis Bloßfeld (Germany) <br /> David Coulot (France) <br /> Athanasios Dermanis (Greece) <br /> Richard Gross (USA) <br /> Tom Herring (USA) <br /> Michael Schindelegger (Austria) <br /> Manuela Seitz (Germany) <br /> Krzysztof Sośnica (Poland) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.22&diff=544JSG0.222020-06-01T09:18:40Z<p>Pendl: Pendl moved page JSG0.22 to JSG T.35</p>
<hr />
<div>#REDIRECT [[JSG T.35]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.35&diff=542JSG T.352020-06-01T09:18:35Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.35: Definition of next generation terrestrial reference frames'''</big><br />
<br />
Chair: ''Christopher Kotsakis (Greece)''<br><br />
Affiliation:''Comm. 1 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
A Terrestrial Reference Frame (TRF) is required for measuring the Earth orientation in space, for positioning objects at the Earth’s surface as well as satellites in orbit around the Earth, and for the analysis of geophysical processes and their spatiotemporal variations. TRFs are currently constructed by sets of tri-dimensional coordinates of ground stations, which implicitly realize the three orthogonal axes of the corresponding frame. To account for Earth’s deformations, these coordinates have been commonly modelled as piece-wise linear functions of time which are estimated from space geodetic data under various processing strategies, resulting to the usual type of geodetic frame solutions in terms of station coordinates (at some reference epoch) and constant velocities. Most recently, post-seismic deformation has been added as well in geodetic frame solutions. The requirements of the Earth science community for the accuracy level of such secular TRFs for present-day applications are in the order of 1 mm and 0.1 mm/year, which is not generally achievable at the present time. Improvements in data analysis models, coordinate variation models, optimal estimation procedures and datum definition choices (e.g. NNR conditions) should still be investigated in order to enhance the present positioning accuracy under the “linear” TRF framework. <br />
<br />
Moreover, the consideration of seasonal changes in the station positions due to the effect of geophysical loading signals and other complex tectonic motions has created an additional interest towards the development of “non-linear” TRFs aiming to provide highly accurate coordinates of the quasi-instantaneous positions in a global network. This approach overcomes the limitation of global secular frames which model the average positions over a long time span, yet it creates significant new challenges and open problems that need to be resolved to meet the aforementioned accuracy requirements.<br />
<br />
The above considerations provide the motivation for this JSG whose work will be focused to studying and improving the current approaches for the definition and realization of global TRFs from space geodetic data, in support of Earth mapping and monitoring applications. The principal aim is to identify the major issues causing the current internal/external accuracy limitations in global TRF solutions, and to investigate possible ways to overcome them either in the linear or the non-linear modeling framework.<br />
<br />
===Objectives===<br />
<br />
* To review and compare from the theoretical point of view the current approaches for the definition and realization of global TRFs, including data reduction strategies and frame estimation methodologies.<br />
* To evaluate the distortion caused by hidden datum information within the unconstrained normal equations (NEQs) to combination solutions by the “minimum constraints” approach, and to develop efficient tools enforcing the appropriate rank deficiency in input NEQs when computing TRF solutions.<br />
* To study the role of the 7/14-parameter Helmert transformation model in handling non-linear (non-secular) global frames, as well as to investigate the frame transformation problem in the presence of modeled seasonal variations in the respective coordinates.<br />
* To study theoretical and numerical aspects of the stacking problem, both at the NEQ level and at the coordinate time-series level, with unknown non-linear seasonal terms when estimating a global frame from space geodetic data.<br />
* To compare the aforementioned methodology with other alternative approaches in non-linear frame modeling, such as the computation of high-rate time series of global TRFs.<br />
* To investigate the modeling choices for the datum definition in global TRFs with particular emphasis on the frame orientation and the different types of no-net-rotation (NNR) conditions.<br />
<br />
===Program of activities===<br />
<br />
* Active participation at major geodetic meetings, promotion of related sessions at international scientific symposia and publication of important findings related to the JSG objectives.<br />
* Proposal for a state-of-art review paper in global frame theory, realization methodologies and open problems, co-authored by the JSG members.<br />
* Organize a related session at the forthcoming Hotine-Marussi Symposium.<br />
* Launching a web page with emphasis on exchange of research ideas, recent results, updated bibliographic list of references and relevant publications from other disciplines.<br />
<br />
===Membership===<br />
<br />
'' '''Christopher Kotsakis (Greece), chair''' <br /> Zuheir Altamimi (France) <br /> Michael Bevis (USA) <br /> Mathis Bloßfeld (Germany) <br /> David Coulot (France) <br /> Athanasios Dermanis (Greece) <br /> Richard Gross (USA) <br /> Tom Herring (USA) <br /> Michael Schindelegger (Austria) <br /> Manuela Seitz (Germany) <br /> Krzysztof Sośnica (Poland) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.34&diff=540JSG T.342020-06-01T09:18:08Z<p>Pendl: Pendl moved page JSG0.21 to JSG T.34</p>
<hr />
<div><big>'''JSG T.34: Geophysical modelling of time variations in deformation and gravity'''</big><br />
<br />
Chair: ''Yoshiyuki Tanaka (Japan)''<br><br />
Affiliation:''Comm. 2 and 3''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
In recent years, observational accuracy of ground-, satellite- and space-geodetic techniques has significantly improved which enables us to monitor temporal variations in surface deformations and gravity over various space and time scales. These variations are related to a wide range of surface and internal Earth’s processes, including the deformational response to glacial loading, solid earth and ocean tides, atmospheric and non-tidal ocean loadings, hydrological phenomena, earthquake and volcano activity, tsunamis from seismic to GIA-process frequencies. The interpretation of such high-accuracy observational data, more advanced theories are required in order to describe the individual processes and to quantify the individual signals in the geodetic data. To facilitate this, interactions between geophysical modelling and data modelling is mandatory. <br />
<br />
===Objectives===<br />
<br />
* Development of 1-D, 2-D, and 3-D elastic/anelastic Earth models for simulating the individual processes causing variations in deformation and gravity.<br />
* Development of phenomenological or dynamic theories to treat deformation and gravity variations which cannot be described by the above earth models (e.g., hydrology, cryosphere, poroelasticity) and consideration of such effects in the above earth models.<br />
* Theoretical study to reveal the mechanisms of the individual processes.<br />
* Comparative study of theoretical methods using the existing codes. <br />
* Forward and inverse modelling of deformation and gravity variations using observational data.<br />
* Development of observational data analysis methods to extract the individual geophysical signals.<br />
<br />
===Program of activities===<br />
<br />
* To launch an e-mail list to share information concerning research results and to interchange ideas for solving related problems.<br />
* To open a web page to share publication lists and its update.<br />
* To hold an international workshop focusing on the above research theme.<br />
* To have sessions at international meetings (EGU, AGU, IAG, etc.) as needed.<br />
<br />
===Membership===<br />
<br />
'' '''Yoshiyuki Tanaka (Japan), chair''' <br /> Zdeněk Martinec (Ireland) <br /> Erik Ivins (USA) <br /> Volker Klemann (Germany) <br /> Johannes Bouman (Germany) <br /> Jose Fernandez (Spain) <br /> Luce Fleitout (France) <br /> Pablo Jose Gonzales (UK) <br /> David Al-Attar (UK) <br /> Giorgio Spada (Italy) <br /> Gabriele Cambiotti (Italy) <br /> Peter Vajda (Slovak Republic) <br /> Wouter van der Wal (Netherlands) <br /> Riccardo Riva (Netherlands) <br /> Taco Broerse (Netherlands) <br /> Shin-Chan Han (Australia) <br /> Guangyu Fu (China) <br /> Benjamin Fong Chao (Taiwan) <br /> Jun'ichi Okuno (Japan) <br /> Masao Nakada (Japan) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.21&diff=541JSG0.212020-06-01T09:18:08Z<p>Pendl: Pendl moved page JSG0.21 to JSG T.34</p>
<hr />
<div>#REDIRECT [[JSG T.34]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.34&diff=539JSG T.342020-06-01T09:18:01Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.34: Geophysical modelling of time variations in deformation and gravity'''</big><br />
<br />
Chair: ''Yoshiyuki Tanaka (Japan)''<br><br />
Affiliation:''Comm. 2 and 3''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
In recent years, observational accuracy of ground-, satellite- and space-geodetic techniques has significantly improved which enables us to monitor temporal variations in surface deformations and gravity over various space and time scales. These variations are related to a wide range of surface and internal Earth’s processes, including the deformational response to glacial loading, solid earth and ocean tides, atmospheric and non-tidal ocean loadings, hydrological phenomena, earthquake and volcano activity, tsunamis from seismic to GIA-process frequencies. The interpretation of such high-accuracy observational data, more advanced theories are required in order to describe the individual processes and to quantify the individual signals in the geodetic data. To facilitate this, interactions between geophysical modelling and data modelling is mandatory. <br />
<br />
===Objectives===<br />
<br />
* Development of 1-D, 2-D, and 3-D elastic/anelastic Earth models for simulating the individual processes causing variations in deformation and gravity.<br />
* Development of phenomenological or dynamic theories to treat deformation and gravity variations which cannot be described by the above earth models (e.g., hydrology, cryosphere, poroelasticity) and consideration of such effects in the above earth models.<br />
* Theoretical study to reveal the mechanisms of the individual processes.<br />
* Comparative study of theoretical methods using the existing codes. <br />
* Forward and inverse modelling of deformation and gravity variations using observational data.<br />
* Development of observational data analysis methods to extract the individual geophysical signals.<br />
<br />
===Program of activities===<br />
<br />
* To launch an e-mail list to share information concerning research results and to interchange ideas for solving related problems.<br />
* To open a web page to share publication lists and its update.<br />
* To hold an international workshop focusing on the above research theme.<br />
* To have sessions at international meetings (EGU, AGU, IAG, etc.) as needed.<br />
<br />
===Membership===<br />
<br />
'' '''Yoshiyuki Tanaka (Japan), chair''' <br /> Zdeněk Martinec (Ireland) <br /> Erik Ivins (USA) <br /> Volker Klemann (Germany) <br /> Johannes Bouman (Germany) <br /> Jose Fernandez (Spain) <br /> Luce Fleitout (France) <br /> Pablo Jose Gonzales (UK) <br /> David Al-Attar (UK) <br /> Giorgio Spada (Italy) <br /> Gabriele Cambiotti (Italy) <br /> Peter Vajda (Slovak Republic) <br /> Wouter van der Wal (Netherlands) <br /> Riccardo Riva (Netherlands) <br /> Taco Broerse (Netherlands) <br /> Shin-Chan Han (Australia) <br /> Guangyu Fu (China) <br /> Benjamin Fong Chao (Taiwan) <br /> Jun'ichi Okuno (Japan) <br /> Masao Nakada (Japan) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.20&diff=538JSG0.202020-06-01T09:17:34Z<p>Pendl: Pendl moved page JSG0.20 to JSG T.33</p>
<hr />
<div>#REDIRECT [[JSG T.33]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.33&diff=537JSG T.332020-06-01T09:17:34Z<p>Pendl: Pendl moved page JSG0.20 to JSG T.33</p>
<hr />
<div><big>'''JSG T.33: Space weather and ionosphere'''</big><br />
<br />
Chair: '': Klaus Börger (Germany)''<br><br />
Affiliation:''Commissions 1, 4 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
It is well known that space geodetic methods are under influence of ionospheric refraction, and therefore from the very beginning of these techniques geodesy deals with the ionosphere. In this context sophisticated methods and models have been developed in order to determine, to represent and to predict the ionosphere. Apart from this the ionosphere fits into another issue called „space weather“, which describes the interactions between the constituents of space and earth. To be more precise space weather means the conditions in space with a significant impact on space-based and ground-based technology as well as on earth and its inhabitants. Solar radiation, that is electromagnetic emission as well as particle emission, is the main cause or “drive” of space weather.<br />
<br />
Originally, geodesy, or to be more precise, space geodetic methods have considered the ionosphere as a disturbing factor that affects signal propagation and that has to be corrected. This (geodetic) perspective has been changed over time and the ionosphere has become a target value so that geodetic observations are used to determine the ionosphere. Different groups have developed models of high quality, e.g. 3D-models which describe the ionosphere as a function of longitude, latitude and time or even 4D-models accounting for the height as well. However, since the ionosphere is a manifestation of space weather, geodesy should contribute to space weather research, and in this respect completely new scientific questions arise, in particular with respect to the so called “geo-effect”, which is the impact of space weather in general.<br />
<br />
There are two principal goals of the proposed study group. First, to connect the “geodetic” ionosphere research with solar-terrestrial physics, in order to consider the complete cause-effect-chain. Second, the above mentioned “geo-effect” has to be investigated in detail, which is an important aspect, because modern society depends to a great extent on technology, i.e. technology that can be disturbed, that can be harmed or that even can be destroyed by extreme space weather events<br />
<br />
===Objectives===<br />
<br />
* improvements and enlargements of ionosphere models (including scintillations)<br />
* geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on satellite motion<br />
* geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on communication <br />
* investigations of the impact of space weather/the ionosphere (extreme events) on remote sensing products <br />
* investigations of the impact of space weather/the ionosphere (extreme events) on terrestrial technical infrastructure (metallic networks, power grids)<br />
* “geodetic observations” of currents (ring current, electrojets)<br />
<br />
===Program of activities===<br />
<br />
* the maintaining of a website for general information as well as for internal exchange of data sets and results<br />
* organization of a workshop w.r.t. space weather and geo-effects<br />
* publication of important findings<br />
<br />
===Membership===<br />
<br />
'' '''Klaus Börger (Germany), chair''' <br /> Mahmut Onur Karsioglu (Turkey), vice-chair <br /> Michael Schmidt (Germany) <br /> Jürgen Matzka (Germany) <br /> Barbara Görres (Germany) <br /> George Zhizhao Liu (Hong Kong, China) <br /> Ehsan Forootan (Germany) <br /> Johannes Hinrichs (Germany) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.33&diff=536JSG T.332020-06-01T09:17:27Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.33: Space weather and ionosphere'''</big><br />
<br />
Chair: '': Klaus Börger (Germany)''<br><br />
Affiliation:''Commissions 1, 4 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
It is well known that space geodetic methods are under influence of ionospheric refraction, and therefore from the very beginning of these techniques geodesy deals with the ionosphere. In this context sophisticated methods and models have been developed in order to determine, to represent and to predict the ionosphere. Apart from this the ionosphere fits into another issue called „space weather“, which describes the interactions between the constituents of space and earth. To be more precise space weather means the conditions in space with a significant impact on space-based and ground-based technology as well as on earth and its inhabitants. Solar radiation, that is electromagnetic emission as well as particle emission, is the main cause or “drive” of space weather.<br />
<br />
Originally, geodesy, or to be more precise, space geodetic methods have considered the ionosphere as a disturbing factor that affects signal propagation and that has to be corrected. This (geodetic) perspective has been changed over time and the ionosphere has become a target value so that geodetic observations are used to determine the ionosphere. Different groups have developed models of high quality, e.g. 3D-models which describe the ionosphere as a function of longitude, latitude and time or even 4D-models accounting for the height as well. However, since the ionosphere is a manifestation of space weather, geodesy should contribute to space weather research, and in this respect completely new scientific questions arise, in particular with respect to the so called “geo-effect”, which is the impact of space weather in general.<br />
<br />
There are two principal goals of the proposed study group. First, to connect the “geodetic” ionosphere research with solar-terrestrial physics, in order to consider the complete cause-effect-chain. Second, the above mentioned “geo-effect” has to be investigated in detail, which is an important aspect, because modern society depends to a great extent on technology, i.e. technology that can be disturbed, that can be harmed or that even can be destroyed by extreme space weather events<br />
<br />
===Objectives===<br />
<br />
* improvements and enlargements of ionosphere models (including scintillations)<br />
* geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on satellite motion<br />
* geodetic contributions to investigate the impact of space weather/the ionosphere (extreme events) on communication <br />
* investigations of the impact of space weather/the ionosphere (extreme events) on remote sensing products <br />
* investigations of the impact of space weather/the ionosphere (extreme events) on terrestrial technical infrastructure (metallic networks, power grids)<br />
* “geodetic observations” of currents (ring current, electrojets)<br />
<br />
===Program of activities===<br />
<br />
* the maintaining of a website for general information as well as for internal exchange of data sets and results<br />
* organization of a workshop w.r.t. space weather and geo-effects<br />
* publication of important findings<br />
<br />
===Membership===<br />
<br />
'' '''Klaus Börger (Germany), chair''' <br /> Mahmut Onur Karsioglu (Turkey), vice-chair <br /> Michael Schmidt (Germany) <br /> Jürgen Matzka (Germany) <br /> Barbara Görres (Germany) <br /> George Zhizhao Liu (Hong Kong, China) <br /> Ehsan Forootan (Germany) <br /> Johannes Hinrichs (Germany) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.32&diff=534JSG T.322020-06-01T09:17:05Z<p>Pendl: Pendl moved page JSG0.19 to JSG T.32</p>
<hr />
<div><big>'''JSG T.32: Time series analysis in geodesy'''</big><br />
<br />
Chair: ''Wieslaw Kosek (Poland)''<br><br />
Affiliation:''Comm. 3 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
Observations of the space geodesy techniques and on the Earth's surface deliver a global picture of the Earth dynamics represented in the form of time series which describe 1) changes of the Earth surface geometry, 2) the fluctuations in the Earth orientation, and 3) the variations of the Earth’s gravitational field. The Earth's surface geometry, rotation and gravity field are the three components of the Global Geodetic Observing System (GGOS) which integrates them into one unique physical and mathematical model. However, temporal variations of these three components represent the total, integral effect of all global mass exchange between all elements of the Earth’s system including the Earth's interior and fluid layers: atmosphere, ocean and land hydrology.<br />
<br />
Different time series analysis methods have been applied to analyze all these geodetic time series for better understanding of the relations between all elements of the Earth’s system as well as their geophysical causes. The interactions between different components of the Earth’s system are very complex so the nature of considered signals in the geodetic time series is mostly wideband, irregular and non-stationary. Thus, it is recommended to apply wavelet based spectra-temporal analysis methods to analyze these geodetic time series as well as to explain their relations to geophysical processes in different frequency bands using time-frequency semblance and coherence methods. These spectra-temporal analysis methods and time-frequency semblance and coherence may be further developed to display reliably the features of the temporal or spatial variability of signals existing in various geodetic data, as well as in other source data sources.<br />
<br />
Geodetic time series include for example horizontal and vertical deformations of site positions determined from observations of space geodetic techniques. These site positions change due to e.g. plate tectonics, postglacial rebound, atmospheric, hydrology and ocean loading and earthquakes. However they are used to build the global international terrestrial reference frame (ITRF) which must be stable reference for all other geodetic observations including e.g. satellite orbit parameters and Earth's orientation parameters which consist of precession, nutation, polar motion and UT1-UTC that are necessary for transformation between the terrestrial and celestial reference frames. Geodetic time series include also temporal variations of Earth's gravity field where 1 arc-deg spherical harmonics correspond to the Earth’s centre of mass variations (long term mean of them determines the ITRF origin) and 2 degree spherical harmonics correspond to Earth rotation changes. Time series analysis methods can be also applied to analyze data on the Earth's surface including maps of the gravity field, sea level, ice covers, ionospheric total electron content and tropospheric delay as well as temporal variations of such surface data. The main problems to deal with include the estimation of deterministic (including trend and periodic variations) and stochastic (non-periodic variations and random changes) components of the geodetic time series as well as the application of digital filters for extracting specific components with a chosen frequency bandwidth.<br />
<br />
The multiple methods of time series analysis may be encouraged to be applied to the preprocessing of raw data from various geodetic measurements in order to promote the quality level of enhancement of signals existing in these data. The topic on the improvement of the edge effects in time series analysis may also be considered, since they may affect the reliability of long-range tendency (trends) estimated from data series as well as the real-time data processing and prediction.<br />
<br />
For coping with small geodetic samples one can apply simulation-based methods and if the data are sparse, Monte-Carlo simulation or bootstrap technique may be useful. Understanding the nature of geodetic time series is very important from the point of view of appropriate spectral analysis as well as application of filtering and prediction methods.<br />
<br />
===Objectives===<br />
<br />
* Study of the nature of geodetic time series to choose optimum time series analysis methods for filtering, spectral analysis, time frequency analysis and prediction.<br />
* Study of Earth's geometry, rotation and gravity field variations and their geophysical causes in different frequency bands.<br />
* Evaluation of appropriate covariance matrices for the time series by applying the law of error propagation to the original measurements, including weighting schemes, regularization, etc.<br />
* Determination of the statistical significance levels of the results obtained by different time series analysis methods and algorithms applied to geodetic time series.<br />
* Development and comparison of different time series analysis methods in order to point out their advantages and disadvantages.<br />
* Recommendations of different time series analysis methods for solving problems concerning specific geodetic time series.<br />
<br />
===Program of activities===<br />
<br />
* Launching of a website about time series analysis in geodesy providing list of papers from different disciplines as well as unification of terminology applied in time series analysis.<br />
* Working meetings at the international symposia and presentation of research results at the appropriate sessions.<br />
<br />
===Membership===<br />
<br />
'' '''Wieslaw Kosek (Poland), chair''' <br /> Michael Schmidt (Germany) <br /> Jan Vondrák (Czech Republic) <br /> Waldemar Popinski (Poland) <br /> Tomasz Niedzielski (Poland) <br /> Johannes Boehm (Austria) <br /> Dawei Zheng (China) <br /> Yonghong Zhou (China) <br /> Mahmut O. Karslioglu (Turkey) <br /> Orhan Akyilmaz (Turkey) <br /> Laura Fernandez (Argentina) <br /> Richard Gross (USA) <br /> Olivier de Viron (France) <br /> Sergei Petrov (Russia) <br /> Michel Van Camp (Belgium) <br /> Hans Neuner (Germany) <br /> Xavier Collilieux (France) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.19&diff=535JSG0.192020-06-01T09:17:05Z<p>Pendl: Pendl moved page JSG0.19 to JSG T.32</p>
<hr />
<div>#REDIRECT [[JSG T.32]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.32&diff=533JSG T.322020-06-01T09:16:59Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.32: Time series analysis in geodesy'''</big><br />
<br />
Chair: ''Wieslaw Kosek (Poland)''<br><br />
Affiliation:''Comm. 3 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
Observations of the space geodesy techniques and on the Earth's surface deliver a global picture of the Earth dynamics represented in the form of time series which describe 1) changes of the Earth surface geometry, 2) the fluctuations in the Earth orientation, and 3) the variations of the Earth’s gravitational field. The Earth's surface geometry, rotation and gravity field are the three components of the Global Geodetic Observing System (GGOS) which integrates them into one unique physical and mathematical model. However, temporal variations of these three components represent the total, integral effect of all global mass exchange between all elements of the Earth’s system including the Earth's interior and fluid layers: atmosphere, ocean and land hydrology.<br />
<br />
Different time series analysis methods have been applied to analyze all these geodetic time series for better understanding of the relations between all elements of the Earth’s system as well as their geophysical causes. The interactions between different components of the Earth’s system are very complex so the nature of considered signals in the geodetic time series is mostly wideband, irregular and non-stationary. Thus, it is recommended to apply wavelet based spectra-temporal analysis methods to analyze these geodetic time series as well as to explain their relations to geophysical processes in different frequency bands using time-frequency semblance and coherence methods. These spectra-temporal analysis methods and time-frequency semblance and coherence may be further developed to display reliably the features of the temporal or spatial variability of signals existing in various geodetic data, as well as in other source data sources.<br />
<br />
Geodetic time series include for example horizontal and vertical deformations of site positions determined from observations of space geodetic techniques. These site positions change due to e.g. plate tectonics, postglacial rebound, atmospheric, hydrology and ocean loading and earthquakes. However they are used to build the global international terrestrial reference frame (ITRF) which must be stable reference for all other geodetic observations including e.g. satellite orbit parameters and Earth's orientation parameters which consist of precession, nutation, polar motion and UT1-UTC that are necessary for transformation between the terrestrial and celestial reference frames. Geodetic time series include also temporal variations of Earth's gravity field where 1 arc-deg spherical harmonics correspond to the Earth’s centre of mass variations (long term mean of them determines the ITRF origin) and 2 degree spherical harmonics correspond to Earth rotation changes. Time series analysis methods can be also applied to analyze data on the Earth's surface including maps of the gravity field, sea level, ice covers, ionospheric total electron content and tropospheric delay as well as temporal variations of such surface data. The main problems to deal with include the estimation of deterministic (including trend and periodic variations) and stochastic (non-periodic variations and random changes) components of the geodetic time series as well as the application of digital filters for extracting specific components with a chosen frequency bandwidth.<br />
<br />
The multiple methods of time series analysis may be encouraged to be applied to the preprocessing of raw data from various geodetic measurements in order to promote the quality level of enhancement of signals existing in these data. The topic on the improvement of the edge effects in time series analysis may also be considered, since they may affect the reliability of long-range tendency (trends) estimated from data series as well as the real-time data processing and prediction.<br />
<br />
For coping with small geodetic samples one can apply simulation-based methods and if the data are sparse, Monte-Carlo simulation or bootstrap technique may be useful. Understanding the nature of geodetic time series is very important from the point of view of appropriate spectral analysis as well as application of filtering and prediction methods.<br />
<br />
===Objectives===<br />
<br />
* Study of the nature of geodetic time series to choose optimum time series analysis methods for filtering, spectral analysis, time frequency analysis and prediction.<br />
* Study of Earth's geometry, rotation and gravity field variations and their geophysical causes in different frequency bands.<br />
* Evaluation of appropriate covariance matrices for the time series by applying the law of error propagation to the original measurements, including weighting schemes, regularization, etc.<br />
* Determination of the statistical significance levels of the results obtained by different time series analysis methods and algorithms applied to geodetic time series.<br />
* Development and comparison of different time series analysis methods in order to point out their advantages and disadvantages.<br />
* Recommendations of different time series analysis methods for solving problems concerning specific geodetic time series.<br />
<br />
===Program of activities===<br />
<br />
* Launching of a website about time series analysis in geodesy providing list of papers from different disciplines as well as unification of terminology applied in time series analysis.<br />
* Working meetings at the international symposia and presentation of research results at the appropriate sessions.<br />
<br />
===Membership===<br />
<br />
'' '''Wieslaw Kosek (Poland), chair''' <br /> Michael Schmidt (Germany) <br /> Jan Vondrák (Czech Republic) <br /> Waldemar Popinski (Poland) <br /> Tomasz Niedzielski (Poland) <br /> Johannes Boehm (Austria) <br /> Dawei Zheng (China) <br /> Yonghong Zhou (China) <br /> Mahmut O. Karslioglu (Turkey) <br /> Orhan Akyilmaz (Turkey) <br /> Laura Fernandez (Argentina) <br /> Richard Gross (USA) <br /> Olivier de Viron (France) <br /> Sergei Petrov (Russia) <br /> Michel Van Camp (Belgium) <br /> Hans Neuner (Germany) <br /> Xavier Collilieux (France) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.18&diff=532JSG0.182020-06-01T09:16:39Z<p>Pendl: Pendl moved page JSG0.18 to JSG T.31</p>
<hr />
<div>#REDIRECT [[JSG T.31]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.31&diff=531JSG T.312020-06-01T09:16:39Z<p>Pendl: Pendl moved page JSG0.18 to JSG T.31</p>
<hr />
<div><big>'''JSG T.31: High resolution harmonic analysis and synthesis of potential fields'''</big><br />
<br />
Chair: ''Sten Claessens (Australia)''<br><br />
Affiliation:''Comm. 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
The gravitational fields of the Earth and other celestial bodies in the Solar System are customarily represented by a series of spherical harmonic coefficients. The models made up of these harmonic coefficients are used widely in a large range of applications within geodesy. In addition, spherical harmonics are now used in many other areas of science such as geomagnetism, particle physics, planetary geophysics, biochemistry and computer graphics, but one of the first applications of spherical harmonics was related to the gravitational potential, and geodesists are still at the forefront of research into spherical harmonics. This holds true especially when it comes to the extension of spherical harmonic series to ever higher degree and order (d/o).<br />
The maximum d/o of spherical harmonic series of the Earth’s gravitational potential has risen steadily over the past decades. The highest d/o models currently listed by the International Centre for Global Earth Models (ICGEM) have a maximum d/o of 2190. In recent years, spherical harmonic models of the topography and topographic potential to d/o 10,800 have been computed, and with ever-increasing computational prowess, expansions to even higher d/o are feasible. For comparison, the current highest-resolution global gravity model has a resolution of 7.2” in the space domain, which is roughly equivalent to d/o 90,000 in the frequency domain, while the highest-resolution global Digital Elevation Model has a resolution of 5 m, equivalent to d/o ~4,000,000.<br />
<br />
The increasing maximum d/o of harmonic models has posed and continues to pose both theoretical and practical challenges for the geodetic community. For example, the computation of associated Legendre functions of the first kind, which are required for spherical harmonic analysis and synthesis, is traditionally subject to numerical instabilities and underflow/overflow problems. Much progress has been made on this issue by selection of suitable recurrence relations, summation strategies, and use of extended range arithmetic, but further improvements to efficiency may still be achieved. <br />
<br />
There are further separate challenges in ultra-high d/o harmonic analysis (the forward harmonic transform) and synthesis (the inverse harmonic transform). Many methods for the forward harmonic transform exist, typically separated into least-squares and quadrature methods, and further comparison between the two at high d/o, including studying the influence of aliasing, is of interest. The inverse harmonic transform, including synthesis of a large variety of quantities, has received much interest in recent years. In moving towards higher d/o series, highly efficient algorithms for synthesis on irregular surfaces and/or in scattered point locations, are of utmost importance. <br />
<br />
Another question that has occupied geodesists for many decades is whether there is a substantial benefit to the use of oblate ellipsoidal (or spheroidal) harmonics instead of spherical harmonics. The limitations of the spherical harmonic series for use on or near the Earth’s surface are becoming more and more apparent as the maximum d/o of the harmonic series increase. There are still open questions about the divergence effect and the amplification of the omission error in spherical and spheroidal harmonic series inside the Brillouin surface. <br />
<br />
The Hotine-Jekeli transformation between spherical and spheroidal harmonic coefficients has proven very useful, in particular for spherical harmonic analysis of data on a reference ellipsoid. It has recently been improved upon and extended, while alternatives using surface spherical harmonics have also been proposed, but the performance of the transformations at very high d/o may be improved further. Direct use of spheroidal harmonic series requires (ratios of) associated Legendre functions of the second kind, and their stable and efficient computation is also of ongoing interest.<br />
<br />
===Objectives===<br />
<br />
The objectives of this study group are to:<br />
* Create and compare stable and efficient methods for computation of ultra-high degree and order associated Legendre functions of the first and second kind (or ratios thereof), plus its derivatives and integrals.<br />
* Study the divergence effect of ultra-high degree spherical and spheroidal harmonic series inside the Brillouin sphere/spheroid.<br />
* Verify the numerical performance of transformations between spherical and spheroidal harmonic coefficients to ultra-high degree and order.<br />
* Compare least-squares and quadrature approaches to very high-degree and order spherical and spheroidal harmonic analysis.<br />
* Study efficient methods for ultra-high degree and order harmonic analysis (the forward harmonic transform) for a variety of data types and boundary surfaces.<br />
* Study efficient methods for ultra-high degree and order harmonic synthesis (the inverse harmonic transform) of point values and area means of all potential quantities of interest on regular and irregular surfaces.<br />
<br />
===Program of activities===<br />
<br />
* Providing a platform for increased cooperation between group members, facilitating and encouraging exchange of ideas and research results.<br />
* Creating and updating a bibliographic list of relevant publications from both the geodetic community as well as other disciplines for the perusal of group members.<br />
* Organizing working meetings at international symposia and presenting research results in the appropriate sessions.<br />
<br />
===Membership===<br />
<br />
'' '''Sten Claessens (Australia), chair''' <br /> Hussein Abd-Elmotaal (Egypt) <br /> Oleh Abrykosov (Germany) <br /> Blažej Bucha (Slovakia) <br /> Toshio Fukushima (Japan) <br /> Thomas Grombein (Germany) <br /> Christian Gruber (Germany) <br /> Eliška Hamáčková (Czech Republic) <br /> Christian Hirt (Germany) <br /> Christopher Jekeli (USA) <br /> Otakar Nesvadba (Czech Republic) <br /> Moritz Rexer (Germany) <br /> Josef Sebera (Czech Republic) <br /> Kurt Seitz (Germany) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.31&diff=530JSG T.312020-06-01T09:16:32Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.31: High resolution harmonic analysis and synthesis of potential fields'''</big><br />
<br />
Chair: ''Sten Claessens (Australia)''<br><br />
Affiliation:''Comm. 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
The gravitational fields of the Earth and other celestial bodies in the Solar System are customarily represented by a series of spherical harmonic coefficients. The models made up of these harmonic coefficients are used widely in a large range of applications within geodesy. In addition, spherical harmonics are now used in many other areas of science such as geomagnetism, particle physics, planetary geophysics, biochemistry and computer graphics, but one of the first applications of spherical harmonics was related to the gravitational potential, and geodesists are still at the forefront of research into spherical harmonics. This holds true especially when it comes to the extension of spherical harmonic series to ever higher degree and order (d/o).<br />
The maximum d/o of spherical harmonic series of the Earth’s gravitational potential has risen steadily over the past decades. The highest d/o models currently listed by the International Centre for Global Earth Models (ICGEM) have a maximum d/o of 2190. In recent years, spherical harmonic models of the topography and topographic potential to d/o 10,800 have been computed, and with ever-increasing computational prowess, expansions to even higher d/o are feasible. For comparison, the current highest-resolution global gravity model has a resolution of 7.2” in the space domain, which is roughly equivalent to d/o 90,000 in the frequency domain, while the highest-resolution global Digital Elevation Model has a resolution of 5 m, equivalent to d/o ~4,000,000.<br />
<br />
The increasing maximum d/o of harmonic models has posed and continues to pose both theoretical and practical challenges for the geodetic community. For example, the computation of associated Legendre functions of the first kind, which are required for spherical harmonic analysis and synthesis, is traditionally subject to numerical instabilities and underflow/overflow problems. Much progress has been made on this issue by selection of suitable recurrence relations, summation strategies, and use of extended range arithmetic, but further improvements to efficiency may still be achieved. <br />
<br />
There are further separate challenges in ultra-high d/o harmonic analysis (the forward harmonic transform) and synthesis (the inverse harmonic transform). Many methods for the forward harmonic transform exist, typically separated into least-squares and quadrature methods, and further comparison between the two at high d/o, including studying the influence of aliasing, is of interest. The inverse harmonic transform, including synthesis of a large variety of quantities, has received much interest in recent years. In moving towards higher d/o series, highly efficient algorithms for synthesis on irregular surfaces and/or in scattered point locations, are of utmost importance. <br />
<br />
Another question that has occupied geodesists for many decades is whether there is a substantial benefit to the use of oblate ellipsoidal (or spheroidal) harmonics instead of spherical harmonics. The limitations of the spherical harmonic series for use on or near the Earth’s surface are becoming more and more apparent as the maximum d/o of the harmonic series increase. There are still open questions about the divergence effect and the amplification of the omission error in spherical and spheroidal harmonic series inside the Brillouin surface. <br />
<br />
The Hotine-Jekeli transformation between spherical and spheroidal harmonic coefficients has proven very useful, in particular for spherical harmonic analysis of data on a reference ellipsoid. It has recently been improved upon and extended, while alternatives using surface spherical harmonics have also been proposed, but the performance of the transformations at very high d/o may be improved further. Direct use of spheroidal harmonic series requires (ratios of) associated Legendre functions of the second kind, and their stable and efficient computation is also of ongoing interest.<br />
<br />
===Objectives===<br />
<br />
The objectives of this study group are to:<br />
* Create and compare stable and efficient methods for computation of ultra-high degree and order associated Legendre functions of the first and second kind (or ratios thereof), plus its derivatives and integrals.<br />
* Study the divergence effect of ultra-high degree spherical and spheroidal harmonic series inside the Brillouin sphere/spheroid.<br />
* Verify the numerical performance of transformations between spherical and spheroidal harmonic coefficients to ultra-high degree and order.<br />
* Compare least-squares and quadrature approaches to very high-degree and order spherical and spheroidal harmonic analysis.<br />
* Study efficient methods for ultra-high degree and order harmonic analysis (the forward harmonic transform) for a variety of data types and boundary surfaces.<br />
* Study efficient methods for ultra-high degree and order harmonic synthesis (the inverse harmonic transform) of point values and area means of all potential quantities of interest on regular and irregular surfaces.<br />
<br />
===Program of activities===<br />
<br />
* Providing a platform for increased cooperation between group members, facilitating and encouraging exchange of ideas and research results.<br />
* Creating and updating a bibliographic list of relevant publications from both the geodetic community as well as other disciplines for the perusal of group members.<br />
* Organizing working meetings at international symposia and presenting research results in the appropriate sessions.<br />
<br />
===Membership===<br />
<br />
'' '''Sten Claessens (Australia), chair''' <br /> Hussein Abd-Elmotaal (Egypt) <br /> Oleh Abrykosov (Germany) <br /> Blažej Bucha (Slovakia) <br /> Toshio Fukushima (Japan) <br /> Thomas Grombein (Germany) <br /> Christian Gruber (Germany) <br /> Eliška Hamáčková (Czech Republic) <br /> Christian Hirt (Germany) <br /> Christopher Jekeli (USA) <br /> Otakar Nesvadba (Czech Republic) <br /> Moritz Rexer (Germany) <br /> Josef Sebera (Czech Republic) <br /> Kurt Seitz (Germany) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.30&diff=528JSG T.302020-06-01T09:16:09Z<p>Pendl: Pendl moved page JSG0.17 to JSG T.30</p>
<hr />
<div><big>'''JSG T.30: Multi-GNSS theory and algorithms'''</big><br />
<br />
Chair: ''Amir Khodabandeh (Australia)''<br><br />
Affiliation:''Comm. 1, 4 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
In recent years, we are witnessing rapid development in the satellite-based navigation and positioning systems. Next to the modernization of the GPS dual-frequency signals to the triple-frequency signals, the GLONASS satellites have been revitalized and become fully operational. The new global and regional satellite constellations are also joining the family of the navigation systems. These additions are the two global systems of Galileo and BeiDou satellites as well as the two regional systems of QZSS and IRNSS satellites. This namely means that many more satellites will be visible to the GNSS users, transmitting data on many more frequencies than the current GPS dual-frequency setup, thereby expecting considerable improvement in the performance of the positioning and non-positioning GNSS applications.<br />
<br />
Such a proliferation of multi-system, multi-frequency data demands rigorous theoretical frameworks, models and algorithms that enable the near-future multiple GNSSs to serve as a high-accuracy and high-integrity tool for the Earth-, atmospheric- and space-sciences. For instance, recent studies have revealed the existence of non-zero inter-system and inter-system-type biases that, if ignored, result in a catastrophic failure of integer ambiguity resolution, thus deteriorating the corresponding ambiguity resolved solutions. The availability of the new multi-system, multi-frequency data does therefore appeal proper mathematical models so as to enable one to correctly integrate such data, thus correctly linking the data to the estimable parameters of interest.<br />
<br />
===Objectives===<br />
<br />
The main objectives of this study group are:<br />
* to identify and investigate challenges that are posed by processing and integrating the data of the next generation navigation and positioning satellite systems,<br />
* to develop new functional and stochastic models linking the multi-GNSS observations to the positioning and non-positioning parameters,<br />
* to derive optimal methods that are capable of handling the data-processing of large-scale networks of mixed-receiver types tracking multi-GNSS satellites,<br />
* to conduct an in-depth analysis of the systematic satellite- and receiver-dependent biases that are present either within one or between multiple satellite systems,<br />
* to develop rigorous quality-control and integrity tools for evaluating the reliability of the multi-GNSS data and guarding the underlying models against any mis-modelled effects,<br />
* to access the compatibility of the real-time multi-GNSS input parameters for positioning and non-positioning products,<br />
* to articulate the theoretical developments and findings through the journals and conference proceedings.<br />
<br />
===Program of activities===<br />
<br />
While the investigation will be strongly based on the theoretical aspects of the multi-GNSS observation modelling and challenges, they will be also accompanied by numerical studies of both the simulated and real-world data. Given the expertise of each member, the underlying studies will be conducted on both individual and collaborative bases. The outputs of the group study is to provide the geodesy and GNSS communities with well-documented models and algorithmic methods through the journals and conference proceedings.<br />
<br />
===Members===<br />
<br />
'' '''Amir Khodabandeh (Australia), chair''' <br /> Peter J.G. Teunissen (Australia) <br /> Pawel Wielgosz (Poland) <br /> Bofeng Li (China) <br /> Simon Banville (Canada) <br /> Nobuaki Kubo (Japan) <br /> Ali Reza Amiri-Simkooei (Iran) <br /> Gabriele Giorgi (Germany) <br /> Thalia Nikolaidou (Canada) <br /> Robert Odolinski (New Zealand) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.17&diff=529JSG0.172020-06-01T09:16:09Z<p>Pendl: Pendl moved page JSG0.17 to JSG T.30</p>
<hr />
<div>#REDIRECT [[JSG T.30]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.30&diff=527JSG T.302020-06-01T09:16:02Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.30: Multi-GNSS theory and algorithms'''</big><br />
<br />
Chair: ''Amir Khodabandeh (Australia)''<br><br />
Affiliation:''Comm. 1, 4 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
In recent years, we are witnessing rapid development in the satellite-based navigation and positioning systems. Next to the modernization of the GPS dual-frequency signals to the triple-frequency signals, the GLONASS satellites have been revitalized and become fully operational. The new global and regional satellite constellations are also joining the family of the navigation systems. These additions are the two global systems of Galileo and BeiDou satellites as well as the two regional systems of QZSS and IRNSS satellites. This namely means that many more satellites will be visible to the GNSS users, transmitting data on many more frequencies than the current GPS dual-frequency setup, thereby expecting considerable improvement in the performance of the positioning and non-positioning GNSS applications.<br />
<br />
Such a proliferation of multi-system, multi-frequency data demands rigorous theoretical frameworks, models and algorithms that enable the near-future multiple GNSSs to serve as a high-accuracy and high-integrity tool for the Earth-, atmospheric- and space-sciences. For instance, recent studies have revealed the existence of non-zero inter-system and inter-system-type biases that, if ignored, result in a catastrophic failure of integer ambiguity resolution, thus deteriorating the corresponding ambiguity resolved solutions. The availability of the new multi-system, multi-frequency data does therefore appeal proper mathematical models so as to enable one to correctly integrate such data, thus correctly linking the data to the estimable parameters of interest.<br />
<br />
===Objectives===<br />
<br />
The main objectives of this study group are:<br />
* to identify and investigate challenges that are posed by processing and integrating the data of the next generation navigation and positioning satellite systems,<br />
* to develop new functional and stochastic models linking the multi-GNSS observations to the positioning and non-positioning parameters,<br />
* to derive optimal methods that are capable of handling the data-processing of large-scale networks of mixed-receiver types tracking multi-GNSS satellites,<br />
* to conduct an in-depth analysis of the systematic satellite- and receiver-dependent biases that are present either within one or between multiple satellite systems,<br />
* to develop rigorous quality-control and integrity tools for evaluating the reliability of the multi-GNSS data and guarding the underlying models against any mis-modelled effects,<br />
* to access the compatibility of the real-time multi-GNSS input parameters for positioning and non-positioning products,<br />
* to articulate the theoretical developments and findings through the journals and conference proceedings.<br />
<br />
===Program of activities===<br />
<br />
While the investigation will be strongly based on the theoretical aspects of the multi-GNSS observation modelling and challenges, they will be also accompanied by numerical studies of both the simulated and real-world data. Given the expertise of each member, the underlying studies will be conducted on both individual and collaborative bases. The outputs of the group study is to provide the geodesy and GNSS communities with well-documented models and algorithmic methods through the journals and conference proceedings.<br />
<br />
===Members===<br />
<br />
'' '''Amir Khodabandeh (Australia), chair''' <br /> Peter J.G. Teunissen (Australia) <br /> Pawel Wielgosz (Poland) <br /> Bofeng Li (China) <br /> Simon Banville (Canada) <br /> Nobuaki Kubo (Japan) <br /> Ali Reza Amiri-Simkooei (Iran) <br /> Gabriele Giorgi (Germany) <br /> Thalia Nikolaidou (Canada) <br /> Robert Odolinski (New Zealand) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.29&diff=525JSG T.292020-06-01T09:15:37Z<p>Pendl: Pendl moved page JSG0.16 to JSG T.29</p>
<hr />
<div><big>'''JSG T.29: Earth’s inner structure from combined geodetic and geophysical sources'''</big><br />
<br />
Chairs: ''Robert Tenzer (China)''<br><br />
Affiliation: ''Comm. 2 and 3''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
The satellite gravimetry missions, CHAllenging Mini-satellite Payload (CHAMP), the GRavity field and Climate Experiment (GRACE) and the Gravity field and steady-state Ocean Circulation Explorer (GOCE), significantly improved our knowledge on the external gravitational field of the Earth at the long-to-medium wavelengths (approximately up to a spherical harmonic degree of 250). Such improved information in terms of the accuracy and resolution has been utilized in studies of the Earth’s interior for a better understanding of the Earth’s inner structure and processes occurring within the lithosphere and sub-lithospheric mantle. Whereas the long-wavelength spectrum of the Earth’s gravitational field comprises mainly the signature of deep mantle density heterogeneities attributed to mantle convection, the medium wavelengths reflect the density structure of more shallow sources within the lithosphere. This allows studying and interpreting in more detail the gravitational features which are related to the global tectonism (including the oceanic subduction, orogenic formations, earthquakes, global lithospheric plate configuration, etc.), sub-lithospheric stresses, isostatic mechanisms, glacial isostatic adjustment, and other related geodynamic phenomena. Moreover, the Global Gravitational Models (GGMs) have been extensively used in studies of the lithospheric density structure and density interfaces such as for the gravimetric recovery of the Moho depth, lithospheric thickness as well as structure of sedimentary basins. <br />
<br />
Since the gravity observations could not be used alone to interpret the Earth’s inner density structure due to a non-uniqueness of inverse solutions (i.e. infinity many 3-D density structures could be attributed to the Earth’s gravity field), additional information is required to constrain the gravimetric methods for interpreting the Earth’s interior. These constraining data comprise primarily results of seismic surveys as well as additional geophysical, geothermal and geochemical parameters of the Earth. Moreover, numerous recent gravimetric studies of the Earth’s interior focus on the global and regional Moho recovery. The classical isostatic models (according to Airy and Pratt theories) are typically not able to model realistically the actual Moho geometry, due to the fact that the isostatic mass balance depends on loading and effective elastic thickness, rigidity, rheology of the lithosphere and viscosity of the asthenosphere. Moreover, geodynamic processes such as the glacial isostatic adjustment, present-day glacial melting, plate motion and mantle convection contribute to the time-dependent isostatic balance. To overcome these issues, processing strategies of combining gravity and seismic data (and possibly also additional constraining information) have to be applied to determine the actual Moho geometry. <br />
<br />
The gravimetric methods applied in studies of the Earth’s inner density structure comprise - in principle - two categories. The methods for the gravimetric forward modeling are applied to model (and remove) the gravitational signature of known density structures in order to enhance the gravitational contribution of unknown (and sought) density structures and interfaces. The gravimetric inverse methods are then used to interpret these unknown density structures from the refined gravity data. It is obvious that the combination of gravity and seismic data (and other constraining information) is essential especially in solving the gravimetric inverse problems. <br />
<br />
This gives us the platform and opportunities towards improving the theoretical and numerical methods applied in studies of Earth’s interior from multiple data sources, primarily focusing but not restricting only to combining gravimetric and seismic data. It is expected that the gravity data could improve our knowledge of the Earth’s interior over significant proportion of the world where seismic data are sparse or completely absent (such large parts of oceanic areas, Antarctica, Greenland and Africa). The gravity data could also provide additional information on the lithospheric structure and mechanisms, such as global tectonic configuration, geometry of subducted slabs, crustal thickening of orogenic formations and other phenomena. <br />
<br />
===Objectives===<br />
<br />
* Development of the theoretical and numerical algorithms for combined processing of gravity, seismic and other types of geophysical data for a recovery of the Earth’s density structures and interfaces.<br />
* Development of fast numerical algorithms for combined data inversions.<br />
* Development of stochastic models for combined inversion including optimal weighting, regularization and spectral filtering. <br />
* Better understanding of uncertainties of interpreted results based on the error analysis of input data and applied numerical models. Geophysical and geodynamic clarification of results and their uncertainties.<br />
* Recommendations for optimal data combinations, better understanding of possibilities and limiting factors associated with individual data types used for geophysical and geodynamic interpretations.<br />
<br />
===Program of activities===<br />
<br />
* Launching of a web page with emphasis on exchange of ideas and recent progress, providing and updating bibliographic list of references of research results and relevant publications from different disciplines.<br />
* Work progress meetings at the international symposia and presentation of research results at the appropriate sessions.<br />
* Possible collaboration between various geoscience study groups dealing with the modeling of the Earth’s interior and related scientific topics. <br />
<br />
===Members===<br />
<br />
'' '''Robert Tenzer (China), chair''' <br /> Lars Sjöberg (Sweden) <br /> Mohammad Bagherbandi (Sweden) <br /> Carla Braitenberg (Italy) <br /> Mehdi Eshagh (Sweden) <br /> Mirko Reguzzoni (Italy) <br /> Xiaodong Song (USA) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.16&diff=526JSG0.162020-06-01T09:15:37Z<p>Pendl: Pendl moved page JSG0.16 to JSG T.29</p>
<hr />
<div>#REDIRECT [[JSG T.29]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.29&diff=524JSG T.292020-06-01T09:15:32Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.29: Earth’s inner structure from combined geodetic and geophysical sources'''</big><br />
<br />
Chairs: ''Robert Tenzer (China)''<br><br />
Affiliation: ''Comm. 2 and 3''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
The satellite gravimetry missions, CHAllenging Mini-satellite Payload (CHAMP), the GRavity field and Climate Experiment (GRACE) and the Gravity field and steady-state Ocean Circulation Explorer (GOCE), significantly improved our knowledge on the external gravitational field of the Earth at the long-to-medium wavelengths (approximately up to a spherical harmonic degree of 250). Such improved information in terms of the accuracy and resolution has been utilized in studies of the Earth’s interior for a better understanding of the Earth’s inner structure and processes occurring within the lithosphere and sub-lithospheric mantle. Whereas the long-wavelength spectrum of the Earth’s gravitational field comprises mainly the signature of deep mantle density heterogeneities attributed to mantle convection, the medium wavelengths reflect the density structure of more shallow sources within the lithosphere. This allows studying and interpreting in more detail the gravitational features which are related to the global tectonism (including the oceanic subduction, orogenic formations, earthquakes, global lithospheric plate configuration, etc.), sub-lithospheric stresses, isostatic mechanisms, glacial isostatic adjustment, and other related geodynamic phenomena. Moreover, the Global Gravitational Models (GGMs) have been extensively used in studies of the lithospheric density structure and density interfaces such as for the gravimetric recovery of the Moho depth, lithospheric thickness as well as structure of sedimentary basins. <br />
<br />
Since the gravity observations could not be used alone to interpret the Earth’s inner density structure due to a non-uniqueness of inverse solutions (i.e. infinity many 3-D density structures could be attributed to the Earth’s gravity field), additional information is required to constrain the gravimetric methods for interpreting the Earth’s interior. These constraining data comprise primarily results of seismic surveys as well as additional geophysical, geothermal and geochemical parameters of the Earth. Moreover, numerous recent gravimetric studies of the Earth’s interior focus on the global and regional Moho recovery. The classical isostatic models (according to Airy and Pratt theories) are typically not able to model realistically the actual Moho geometry, due to the fact that the isostatic mass balance depends on loading and effective elastic thickness, rigidity, rheology of the lithosphere and viscosity of the asthenosphere. Moreover, geodynamic processes such as the glacial isostatic adjustment, present-day glacial melting, plate motion and mantle convection contribute to the time-dependent isostatic balance. To overcome these issues, processing strategies of combining gravity and seismic data (and possibly also additional constraining information) have to be applied to determine the actual Moho geometry. <br />
<br />
The gravimetric methods applied in studies of the Earth’s inner density structure comprise - in principle - two categories. The methods for the gravimetric forward modeling are applied to model (and remove) the gravitational signature of known density structures in order to enhance the gravitational contribution of unknown (and sought) density structures and interfaces. The gravimetric inverse methods are then used to interpret these unknown density structures from the refined gravity data. It is obvious that the combination of gravity and seismic data (and other constraining information) is essential especially in solving the gravimetric inverse problems. <br />
<br />
This gives us the platform and opportunities towards improving the theoretical and numerical methods applied in studies of Earth’s interior from multiple data sources, primarily focusing but not restricting only to combining gravimetric and seismic data. It is expected that the gravity data could improve our knowledge of the Earth’s interior over significant proportion of the world where seismic data are sparse or completely absent (such large parts of oceanic areas, Antarctica, Greenland and Africa). The gravity data could also provide additional information on the lithospheric structure and mechanisms, such as global tectonic configuration, geometry of subducted slabs, crustal thickening of orogenic formations and other phenomena. <br />
<br />
===Objectives===<br />
<br />
* Development of the theoretical and numerical algorithms for combined processing of gravity, seismic and other types of geophysical data for a recovery of the Earth’s density structures and interfaces.<br />
* Development of fast numerical algorithms for combined data inversions.<br />
* Development of stochastic models for combined inversion including optimal weighting, regularization and spectral filtering. <br />
* Better understanding of uncertainties of interpreted results based on the error analysis of input data and applied numerical models. Geophysical and geodynamic clarification of results and their uncertainties.<br />
* Recommendations for optimal data combinations, better understanding of possibilities and limiting factors associated with individual data types used for geophysical and geodynamic interpretations.<br />
<br />
===Program of activities===<br />
<br />
* Launching of a web page with emphasis on exchange of ideas and recent progress, providing and updating bibliographic list of references of research results and relevant publications from different disciplines.<br />
* Work progress meetings at the international symposia and presentation of research results at the appropriate sessions.<br />
* Possible collaboration between various geoscience study groups dealing with the modeling of the Earth’s interior and related scientific topics. <br />
<br />
===Members===<br />
<br />
'' '''Robert Tenzer (China), chair''' <br /> Lars Sjöberg (Sweden) <br /> Mohammad Bagherbandi (Sweden) <br /> Carla Braitenberg (Italy) <br /> Mehdi Eshagh (Sweden) <br /> Mirko Reguzzoni (Italy) <br /> Xiaodong Song (USA) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.15&diff=523JSG0.152020-06-01T09:14:51Z<p>Pendl: Pendl moved page JSG0.15 to JSG T.28</p>
<hr />
<div>#REDIRECT [[JSG T.28]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.28&diff=522JSG T.282020-06-01T09:14:51Z<p>Pendl: Pendl moved page JSG0.15 to JSG T.28</p>
<hr />
<div><big>'''JSG T.28: Regional geoid/quasi-geoid modelling – Theoretical framework for the sub-centimetre accuracy'''</big><br />
<br />
Chairs: ''Jianliang Huang (Canada)''<br /><br />
Affiliation: ''Comm. 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Problem statement===<br />
<br />
A theoretical framework for the regional geoid/quasi-geoid modelling is a conceptual structure to solve a geodetic boundary value problem regionally. It is a physically sound integration of a set of coherent definitions, physical models and constants, geodetic reference systems and mathematical equations. Current frameworks are designed to solve one of the two geodetic boundary value problems: Stokes’s and Molodensky’s. These frameworks were originally established and subsequently refined for many decades to get the best accuracy of the geoid/quasi-geoid model. The regional geoid/quasi-geoid model can now be determined with an accuracy of a few centimeters in a number of regions in the world, and has been adopted to define new vertical datum replacing the spirit-leveling networks in New Zealand and Canada. More and more countries are modernizing their existing height systems with the geoid-based datum. Yet the geoid model still needs further improvement to match the accuracy of the GNSS-based heightening. This requires the theory and its numerical realization, to be of sub-centimeter accuracy, and the availability of adequate data.<br />
<br />
Regional geoid/quasi-geoid modelling often involves the combination of satellite, airborne, terrestrial (shipborne and land) gravity data through the remove-compute-restore Stokes method and the least-squares collocation. Satellite gravity data from recent gravity missions (GRACE and GOCE) enable to model the geoid components with an accuracy of 1-2 cm at the spatial resolution of 100 km. Airborne gravity data are covering more regions with a variety of accuracies and spatial resolutions such as the US GRAV-D project. They often overlap with terrestrial gravity data, which are still unique in determining the high-degree geoid components. It can be foreseen that gravity data coverage will extend everywhere over lands, in particular, airborne data, in the near future. Furthermore, the digital elevation models required for the gravity reduction have achieved global coverage with redundancy. A pressing question to answer is if these data are sufficiently accurate for the sub-centimeter geoid/quasi-geoid determination. This study group focuses on refining and establishing if necessary the theoretical frameworks of the sub-centimeter geoid/quasi-geoid. <br />
<br />
===Objectives===<br />
<br />
The theoretical frameworks of the sub-centimeter geoid/quasi-geoid consist of, but are not limited to, the following components to study:<br />
* Physical constant GM<br />
* W0 convention and changes<br />
* Geo-center convention and motion with respect to the International Terrestrial Reference Frame (ITRF)<br />
* Geodetic Reference Systems<br />
* Proper formulation of the geodetic boundary value problem<br />
* Nonlinear solution of the formulated geodetic boundary value problem<br />
* Data type, distribution and quality requirements<br />
* Data interpolation and extrapolation methods<br />
* Gravity reduction including downward or upward continuation from observation points down or up to the geoid, in particular over mountainous regions, polar glaciers and ice caps<br />
* Anomalous topographic mass density effect on the geoid model<br />
* Spectral combination of different types of gravity data<br />
* Transformation between the geoid and quasi-geoid models<br />
* The time-variable geoid/quasi-geoid change modelling<br />
* Estimation of the geoid/quasi-geoid model inaccuracies<br />
* Independent validation of geoid/quasi-geoid models<br />
* Applications of new tools such as the radial basis functions <br />
<br />
===Program of activities===<br />
<br />
* The study group achieves its objectives through organizing splinter meetings in coincidence with major IAG conferences and workshops if possible.<br />
* Circulating and sharing progress reports, papers and presentations.<br />
* Presenting and publishing papers in the IAG symposia and scientific journals. <br />
<br />
===Members===<br />
<br />
'' '''Jianliang Huang (Canada), chair''' <br /> '''Yan Ming Wang (USA), vice-chair''' <br /> Riccardo Barzaghi (Italy) <br /> Heiner Denker (Germany) <br /> Will Featherstone (Australia) <br /> René Forsberg (Denmark) <br /> Christian Gerlach (Germany) <br /> Christian Hirt (Germany) <br /> Urs Marti (Switzerland) <br /> Petr Vaníček (Canada) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.28&diff=521JSG T.282020-06-01T09:14:45Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.28: Regional geoid/quasi-geoid modelling – Theoretical framework for the sub-centimetre accuracy'''</big><br />
<br />
Chairs: ''Jianliang Huang (Canada)''<br /><br />
Affiliation: ''Comm. 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Problem statement===<br />
<br />
A theoretical framework for the regional geoid/quasi-geoid modelling is a conceptual structure to solve a geodetic boundary value problem regionally. It is a physically sound integration of a set of coherent definitions, physical models and constants, geodetic reference systems and mathematical equations. Current frameworks are designed to solve one of the two geodetic boundary value problems: Stokes’s and Molodensky’s. These frameworks were originally established and subsequently refined for many decades to get the best accuracy of the geoid/quasi-geoid model. The regional geoid/quasi-geoid model can now be determined with an accuracy of a few centimeters in a number of regions in the world, and has been adopted to define new vertical datum replacing the spirit-leveling networks in New Zealand and Canada. More and more countries are modernizing their existing height systems with the geoid-based datum. Yet the geoid model still needs further improvement to match the accuracy of the GNSS-based heightening. This requires the theory and its numerical realization, to be of sub-centimeter accuracy, and the availability of adequate data.<br />
<br />
Regional geoid/quasi-geoid modelling often involves the combination of satellite, airborne, terrestrial (shipborne and land) gravity data through the remove-compute-restore Stokes method and the least-squares collocation. Satellite gravity data from recent gravity missions (GRACE and GOCE) enable to model the geoid components with an accuracy of 1-2 cm at the spatial resolution of 100 km. Airborne gravity data are covering more regions with a variety of accuracies and spatial resolutions such as the US GRAV-D project. They often overlap with terrestrial gravity data, which are still unique in determining the high-degree geoid components. It can be foreseen that gravity data coverage will extend everywhere over lands, in particular, airborne data, in the near future. Furthermore, the digital elevation models required for the gravity reduction have achieved global coverage with redundancy. A pressing question to answer is if these data are sufficiently accurate for the sub-centimeter geoid/quasi-geoid determination. This study group focuses on refining and establishing if necessary the theoretical frameworks of the sub-centimeter geoid/quasi-geoid. <br />
<br />
===Objectives===<br />
<br />
The theoretical frameworks of the sub-centimeter geoid/quasi-geoid consist of, but are not limited to, the following components to study:<br />
* Physical constant GM<br />
* W0 convention and changes<br />
* Geo-center convention and motion with respect to the International Terrestrial Reference Frame (ITRF)<br />
* Geodetic Reference Systems<br />
* Proper formulation of the geodetic boundary value problem<br />
* Nonlinear solution of the formulated geodetic boundary value problem<br />
* Data type, distribution and quality requirements<br />
* Data interpolation and extrapolation methods<br />
* Gravity reduction including downward or upward continuation from observation points down or up to the geoid, in particular over mountainous regions, polar glaciers and ice caps<br />
* Anomalous topographic mass density effect on the geoid model<br />
* Spectral combination of different types of gravity data<br />
* Transformation between the geoid and quasi-geoid models<br />
* The time-variable geoid/quasi-geoid change modelling<br />
* Estimation of the geoid/quasi-geoid model inaccuracies<br />
* Independent validation of geoid/quasi-geoid models<br />
* Applications of new tools such as the radial basis functions <br />
<br />
===Program of activities===<br />
<br />
* The study group achieves its objectives through organizing splinter meetings in coincidence with major IAG conferences and workshops if possible.<br />
* Circulating and sharing progress reports, papers and presentations.<br />
* Presenting and publishing papers in the IAG symposia and scientific journals. <br />
<br />
===Members===<br />
<br />
'' '''Jianliang Huang (Canada), chair''' <br /> '''Yan Ming Wang (USA), vice-chair''' <br /> Riccardo Barzaghi (Italy) <br /> Heiner Denker (Germany) <br /> Will Featherstone (Australia) <br /> René Forsberg (Denmark) <br /> Christian Gerlach (Germany) <br /> Christian Hirt (Germany) <br /> Urs Marti (Switzerland) <br /> Petr Vaníček (Canada) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.14&diff=520JSG0.142020-06-01T09:14:18Z<p>Pendl: Pendl moved page JSG0.14 to JSG T.27</p>
<hr />
<div>#REDIRECT [[JSG T.27]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.27&diff=519JSG T.272020-06-01T09:14:18Z<p>Pendl: Pendl moved page JSG0.14 to JSG T.27</p>
<hr />
<div><big>'''JSG T.27: Fusion of multi-technique satellite geodetic data'''</big><br />
<br />
Chair: ''Krsyzstof Sośnica (Poland)''<br><br />
Affiliation: ''All Commissions and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
Observations provided by space geodetic techniques deliver a global picture of the changing system Earth, in particular temporal changes of the Earth’s gravity field, irregularities in the Earth rotation and variations of station positions due to various geodynamical phenomena. Different techniques are characterized by different accuracy and different sensitivity to geodetic parameters, e.g., GNSS provides most accurate pole coordinates, but cannot provide the absolute information on UT1-UTC, and thus, must be integrated with VLBI or LLR data. GRACE observations provide state-of-the-art and most accurate information on temporal changes of the gravity field, but the temporal changes of the Earth’s oblateness or the geocentre motion can be better determined using SLR data. Therefore, a fusion of various space geodetic observations is an indispensable prerequisite for a reliable description of the varying system Earth. <br />
<br />
However, the space geodetic observations are typically not free of artifacts related to deficiencies in various models used in the data reduction process. GNSS satellite orbits are very sensitive to deficiencies in solar radiation pressure modeling affecting, e.g., the accuracy of GNSS-derived Earth rotation parameters and geocentre coordinates. Deficiencies in modeling of antenna phase center offsets, albedo and the antenna thrust limit the reliability of GNSS and DORIS-derived scale of the terrestrial reference frame, despite a good global coverage of GNSS receivers and DORIS beacons. VLBI solutions are affected by an inhomogeneous quality delivered by different stations and antenna deformations. SLR technique is affected by the Blue-Sky effect which is related to the weather dependency of laser observations and the station-dependent satellite signature effect due to multiple reflections from many retroreflectors. Moreover, un-modeled horizontal gradients of the troposphere delay in SLR analyzes also limit the quality of SLR solutions. Finally, GRACE data are very sensitive to aliasing with diurnal and semidiurnal tides, whereas GOCE and Swarm orbits show a worse quality around the geomagnetic equator due to deficiencies in ionosphere delay modeling.<br />
<br />
Separation of real geophysical signals and artifacts in geodetic observations yield a very challenging objective. A fusion of different observational techniques of space geodesy may enhance our knowledge on systematic effects, improve the consistency between different observational techniques, and may help us to mitigate artifacts in the geodetic time series.<br />
<br />
The mitigation of artifacts using parameters derived by a fusion of different techniques of space geodesy should comprise three steps: 1) identification of an artifact through an analysis of geodetic parameters derived from multiple techniques; 2) delivering a way to model an artifact; 3) applying the developed model to standard solutions by the analysis centers. <br />
<br />
Improving the consistency level through mitigating artifacts in space geodetic observations will bring us closer to fulfilling the objectives of the Global Geodetic Observing System (GGOS), i.e., the 1-mm accuracy of positions and 0.1-mm/year accuracy of the velocity determination. Without a deep knowledge of systematic effects in satellite geodetic data and without a proper modeling thereof, the accomplishment of the GGOS goals will never be possible. <br />
<br />
===Objectives===<br />
<br />
* Developing of data fusion methods based on geodetic data from different sources<br />
* Accuracy assessment and simulations of geodetic observations in order to fulfil GGOS’ goals<br />
* Study time series of geodetic parameters (geometry, gravity and rotation) and other derivative parameters (e.g., troposphere and ionosphere delays) determined using different techniques of space geodesy<br />
* Investigating biases and systematic effects in single techniques<br />
* Combination of satellite geodetic observations at the observation level and software synchronization<br />
* Investigating various methods of technique co-locations: through local ties, global ties, co-location in space<br />
* Identifying artifacts in time series of geodetic parameters using e.g., spatial, temporal, and spectral analyzes<br />
* Elaborating methods aimed at mitigating systematic effects and artifacts<br />
* Determination of the statistical significance levels of the results obtained by techniques using different methods and algorithms<br />
* Comparison of different methods in order to point out their advantages and disadvantages<br />
* Recommendations for analysis working groups and conventions<br />
<br />
===Planned Activities===<br />
<br />
* Preparing a web page with information concerning integration and consistency of satellite geodetic techniques and their integration with special emphasis on exchange of ideas, providing and updating bibliographic list of references of research results and relevant publications from different disciplines.<br />
* Working meetings at the international symposia and presentation of research results at the appropriate sessions.<br />
<br />
===Members===<br />
<br />
'' '''Krzysztof Sośnica (Poland), chair''' <br /> Toshimichi Otsubo (Japan) <br /> Daniela Thaller (Germany) <br /> Mathis Blossfeld (Germany) <br /> Andrea Maier (Switzerland) <br /> Claudia Flohrer (Germany) <br /> Agnieszka Wnek (Poland) <br /> Sara Bruni (Italy) <br /> Karina Wilgan (Poland) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.27&diff=518JSG T.272020-06-01T09:14:09Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.27: Fusion of multi-technique satellite geodetic data'''</big><br />
<br />
Chair: ''Krsyzstof Sośnica (Poland)''<br><br />
Affiliation: ''All Commissions and GGOS''<br />
<br />
__TOC__<br />
<br />
===Terms of Reference===<br />
<br />
Observations provided by space geodetic techniques deliver a global picture of the changing system Earth, in particular temporal changes of the Earth’s gravity field, irregularities in the Earth rotation and variations of station positions due to various geodynamical phenomena. Different techniques are characterized by different accuracy and different sensitivity to geodetic parameters, e.g., GNSS provides most accurate pole coordinates, but cannot provide the absolute information on UT1-UTC, and thus, must be integrated with VLBI or LLR data. GRACE observations provide state-of-the-art and most accurate information on temporal changes of the gravity field, but the temporal changes of the Earth’s oblateness or the geocentre motion can be better determined using SLR data. Therefore, a fusion of various space geodetic observations is an indispensable prerequisite for a reliable description of the varying system Earth. <br />
<br />
However, the space geodetic observations are typically not free of artifacts related to deficiencies in various models used in the data reduction process. GNSS satellite orbits are very sensitive to deficiencies in solar radiation pressure modeling affecting, e.g., the accuracy of GNSS-derived Earth rotation parameters and geocentre coordinates. Deficiencies in modeling of antenna phase center offsets, albedo and the antenna thrust limit the reliability of GNSS and DORIS-derived scale of the terrestrial reference frame, despite a good global coverage of GNSS receivers and DORIS beacons. VLBI solutions are affected by an inhomogeneous quality delivered by different stations and antenna deformations. SLR technique is affected by the Blue-Sky effect which is related to the weather dependency of laser observations and the station-dependent satellite signature effect due to multiple reflections from many retroreflectors. Moreover, un-modeled horizontal gradients of the troposphere delay in SLR analyzes also limit the quality of SLR solutions. Finally, GRACE data are very sensitive to aliasing with diurnal and semidiurnal tides, whereas GOCE and Swarm orbits show a worse quality around the geomagnetic equator due to deficiencies in ionosphere delay modeling.<br />
<br />
Separation of real geophysical signals and artifacts in geodetic observations yield a very challenging objective. A fusion of different observational techniques of space geodesy may enhance our knowledge on systematic effects, improve the consistency between different observational techniques, and may help us to mitigate artifacts in the geodetic time series.<br />
<br />
The mitigation of artifacts using parameters derived by a fusion of different techniques of space geodesy should comprise three steps: 1) identification of an artifact through an analysis of geodetic parameters derived from multiple techniques; 2) delivering a way to model an artifact; 3) applying the developed model to standard solutions by the analysis centers. <br />
<br />
Improving the consistency level through mitigating artifacts in space geodetic observations will bring us closer to fulfilling the objectives of the Global Geodetic Observing System (GGOS), i.e., the 1-mm accuracy of positions and 0.1-mm/year accuracy of the velocity determination. Without a deep knowledge of systematic effects in satellite geodetic data and without a proper modeling thereof, the accomplishment of the GGOS goals will never be possible. <br />
<br />
===Objectives===<br />
<br />
* Developing of data fusion methods based on geodetic data from different sources<br />
* Accuracy assessment and simulations of geodetic observations in order to fulfil GGOS’ goals<br />
* Study time series of geodetic parameters (geometry, gravity and rotation) and other derivative parameters (e.g., troposphere and ionosphere delays) determined using different techniques of space geodesy<br />
* Investigating biases and systematic effects in single techniques<br />
* Combination of satellite geodetic observations at the observation level and software synchronization<br />
* Investigating various methods of technique co-locations: through local ties, global ties, co-location in space<br />
* Identifying artifacts in time series of geodetic parameters using e.g., spatial, temporal, and spectral analyzes<br />
* Elaborating methods aimed at mitigating systematic effects and artifacts<br />
* Determination of the statistical significance levels of the results obtained by techniques using different methods and algorithms<br />
* Comparison of different methods in order to point out their advantages and disadvantages<br />
* Recommendations for analysis working groups and conventions<br />
<br />
===Planned Activities===<br />
<br />
* Preparing a web page with information concerning integration and consistency of satellite geodetic techniques and their integration with special emphasis on exchange of ideas, providing and updating bibliographic list of references of research results and relevant publications from different disciplines.<br />
* Working meetings at the international symposia and presentation of research results at the appropriate sessions.<br />
<br />
===Members===<br />
<br />
'' '''Krzysztof Sośnica (Poland), chair''' <br /> Toshimichi Otsubo (Japan) <br /> Daniela Thaller (Germany) <br /> Mathis Blossfeld (Germany) <br /> Andrea Maier (Switzerland) <br /> Claudia Flohrer (Germany) <br /> Agnieszka Wnek (Poland) <br /> Sara Bruni (Italy) <br /> Karina Wilgan (Poland) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.26&diff=516JSG T.262020-06-01T09:13:36Z<p>Pendl: Pendl moved page JSG0.13 to JSG T.26</p>
<hr />
<div><big>'''JSG T.26: Integral equations of potential theory for continuation and transformation of classical and new gravitational observables'''</big><br />
<br />
Chair:''Michal Šprlák (Czech Republic)''<br><br />
Affiliation:''Commission 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
The description of the Earth's gravitational field and its temporal variations belongs to fundamental pillars of modern geodesy. The accurate knowledge of the global gravitational field is important in many applications including precise positioning, metrology, geophysics, geodynamics, oceanography, hydrology, cryospheric and other geosciences. Various observation techniques for collecting gravitational data have been invented based on terrestrial, marine, airborne and more recently, satellite sensors. On the other hand, different parametrization methods of the gravitational field were established in geodesy, however, with many unobservable parameters. For this reason, the geodetic science has traditionally been formulating various gravitational parameter transformations, including those based on solving boundary/initial value problems of potential theory, through Fredholm's integral equations.<br />
<br />
Traditionally, Stokes’s, Vening-Meinesz’s and Hotine’s integrals have been of interest in geodesy as they accommodated geodetic applications. In recent history, new geodetic integral transformations were formulated. This effort was mainly initiated by new gravitational observables that became gradually available to geodesists with the advent of precise GNSS (Global Navigation Satellite Systems) positioning, satellite altimetry and aerial gravimetry/gradiometry. The family of integral transformations has enormously been extended with satellite-to-satellite tracking and satellite gradiometric data available from recent gravity-dedicated satellite missions.<br />
<br />
Besides numerous efforts in developing integral equations to cover new observables in geodesy, many aspects of integral equations remain challenging. This study group aims for systematic treatment of integral transformation in geodesy, as many formulations have been performed by making use of various approaches. Many solutions are based on spherical approximation that cannot be justified for globally distributed satellite data and with respect to requirements of various data users requiring gravitational data to be distributed the reference ellipsoid or at constant geodetic altitude. On the other hand, the integral equations in spherical approximation possess symmetric properties that allow for studying their spatial and spectral properties; they also motivate for adopting a generalized notation. New numerically efficient, stable and accurate methods for upward/downward continuation, comparison, validation, transformation, combination and/or for interpretation of gravitational data are also of high interest with increasing availability of large amounts of new data.<br />
<br />
===Objectives===<br />
<br />
* To consider different types of gravitational data, i.e., terrestrial, aerial and satellite, available today and to formulate their mathematical relation to the gravitational potential.<br />
* To study mathematical properties of differential operators in spherical and Jacobi ellipsoidal coordinates, which relate various functionals of the gravitational potential.<br />
* To complete the family of integral equations relating various types of current and foreseen gravitational data and to derive corresponding spherical and ellipsoidal Green’s functions.<br />
* To study accurate and numerically stable methods for upward/downward continuation of gravitational field parameters.<br />
* To investigate optimal combination techniques of heterogeneous gravitational field observables for gravitational field modelling at all scales.<br />
* To investigate conditionality as well as spatial and spectral properties of linear operators based on discretized integral equations.<br />
* To classify integral transformations and to propose suitable generalized notation for a variety of classical and new integral equations in geodesy.<br />
<br />
===Program of Activities===<br />
<br />
* Presenting research results at major international geodetic and geophysical conferences, meetings and workshops.<br />
* Organizing a session at the forthcoming Hotine-Marussi Symposium 2017.<br />
* Cooperating with related IAG Commissions and GGOS.<br />
* Monitoring activities of JGS members as well as other scientists related to the scope of JGS activities.<br />
* Providing bibliographic list of relevant publications from different disciplines in the area of JSG interest.<br />
<br />
===Members===<br />
<br />
'' '''Michal Šprlák (Czech Republic), chair''' <br /> Alireza Ardalan (Iran) <br /> Mehdi Eshagh (Sweden) <br /> Will Featherstone (Australia) <br /> Ismael Foroughi (Canada) <br /> Petr Holota (Czech Republic) <br /> Juraj Janák (Slovakia) <br /> Otakar Nesvadba (Czech Republic) <br /> Pavel Novák (Czech Republic) <br /> Martin Pitoňák (Czech Republic) <br /> Robert Tenzer (China) <br /> Guyla Tóth (Hungary) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.13&diff=517JSG0.132020-06-01T09:13:36Z<p>Pendl: Pendl moved page JSG0.13 to JSG T.26</p>
<hr />
<div>#REDIRECT [[JSG T.26]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.26&diff=515JSG T.262020-06-01T09:13:25Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.26: Integral equations of potential theory for continuation and transformation of classical and new gravitational observables'''</big><br />
<br />
Chair:''Michal Šprlák (Czech Republic)''<br><br />
Affiliation:''Commission 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
The description of the Earth's gravitational field and its temporal variations belongs to fundamental pillars of modern geodesy. The accurate knowledge of the global gravitational field is important in many applications including precise positioning, metrology, geophysics, geodynamics, oceanography, hydrology, cryospheric and other geosciences. Various observation techniques for collecting gravitational data have been invented based on terrestrial, marine, airborne and more recently, satellite sensors. On the other hand, different parametrization methods of the gravitational field were established in geodesy, however, with many unobservable parameters. For this reason, the geodetic science has traditionally been formulating various gravitational parameter transformations, including those based on solving boundary/initial value problems of potential theory, through Fredholm's integral equations.<br />
<br />
Traditionally, Stokes’s, Vening-Meinesz’s and Hotine’s integrals have been of interest in geodesy as they accommodated geodetic applications. In recent history, new geodetic integral transformations were formulated. This effort was mainly initiated by new gravitational observables that became gradually available to geodesists with the advent of precise GNSS (Global Navigation Satellite Systems) positioning, satellite altimetry and aerial gravimetry/gradiometry. The family of integral transformations has enormously been extended with satellite-to-satellite tracking and satellite gradiometric data available from recent gravity-dedicated satellite missions.<br />
<br />
Besides numerous efforts in developing integral equations to cover new observables in geodesy, many aspects of integral equations remain challenging. This study group aims for systematic treatment of integral transformation in geodesy, as many formulations have been performed by making use of various approaches. Many solutions are based on spherical approximation that cannot be justified for globally distributed satellite data and with respect to requirements of various data users requiring gravitational data to be distributed the reference ellipsoid or at constant geodetic altitude. On the other hand, the integral equations in spherical approximation possess symmetric properties that allow for studying their spatial and spectral properties; they also motivate for adopting a generalized notation. New numerically efficient, stable and accurate methods for upward/downward continuation, comparison, validation, transformation, combination and/or for interpretation of gravitational data are also of high interest with increasing availability of large amounts of new data.<br />
<br />
===Objectives===<br />
<br />
* To consider different types of gravitational data, i.e., terrestrial, aerial and satellite, available today and to formulate their mathematical relation to the gravitational potential.<br />
* To study mathematical properties of differential operators in spherical and Jacobi ellipsoidal coordinates, which relate various functionals of the gravitational potential.<br />
* To complete the family of integral equations relating various types of current and foreseen gravitational data and to derive corresponding spherical and ellipsoidal Green’s functions.<br />
* To study accurate and numerically stable methods for upward/downward continuation of gravitational field parameters.<br />
* To investigate optimal combination techniques of heterogeneous gravitational field observables for gravitational field modelling at all scales.<br />
* To investigate conditionality as well as spatial and spectral properties of linear operators based on discretized integral equations.<br />
* To classify integral transformations and to propose suitable generalized notation for a variety of classical and new integral equations in geodesy.<br />
<br />
===Program of Activities===<br />
<br />
* Presenting research results at major international geodetic and geophysical conferences, meetings and workshops.<br />
* Organizing a session at the forthcoming Hotine-Marussi Symposium 2017.<br />
* Cooperating with related IAG Commissions and GGOS.<br />
* Monitoring activities of JGS members as well as other scientists related to the scope of JGS activities.<br />
* Providing bibliographic list of relevant publications from different disciplines in the area of JSG interest.<br />
<br />
===Members===<br />
<br />
'' '''Michal Šprlák (Czech Republic), chair''' <br /> Alireza Ardalan (Iran) <br /> Mehdi Eshagh (Sweden) <br /> Will Featherstone (Australia) <br /> Ismael Foroughi (Canada) <br /> Petr Holota (Czech Republic) <br /> Juraj Janák (Slovakia) <br /> Otakar Nesvadba (Czech Republic) <br /> Pavel Novák (Czech Republic) <br /> Martin Pitoňák (Czech Republic) <br /> Robert Tenzer (China) <br /> Guyla Tóth (Hungary) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG0.12&diff=514JSG0.122020-06-01T09:13:00Z<p>Pendl: Pendl moved page JSG0.12 to JSG T.25</p>
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<div>#REDIRECT [[JSG T.25]]</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.25&diff=513JSG T.252020-06-01T09:13:00Z<p>Pendl: Pendl moved page JSG0.12 to JSG T.25</p>
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<div><big>'''JSG T.25: Advanced computational methods for recovery of high-resolution gravity field models'''</big><br />
<br />
Chairs: ''Robert Čunderlík (Slovakia)''<br><br />
Affiliation: ''Comm. 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
Efficient numerical methods and HPC (high performance computing) facilities provide new opportunities in many applications in geodesy. The goal of the JSG is to apply numerical methods and/or HPC techniques mostly for gravity field modelling and nonlinear filtering of various geodetic data. The discretization numerical methods like the finite element method (FEM), finite volume method (FVM) and boundary element method (BEM) or the meshless methods like the method of fundamental solutions (MFS) or singular boundary method (SOR) can be efficiently used to solve the geodetic boundary value problems and nonlinear diffusion filtering, or to process e.g. the GOCE observations. Their parallel implementations and large-scale parallel computations on clusters with distributed memory using the MPI (Message Passing Interface) standards allows to solve such problems in spatial domains while obtaining high-resolution numerical solutions. <br />
<br />
Our JSG is also open for researchers dealing with the classical approaches of gravity field modelling (e.g. the spherical or ellipsoidal harmonics) that are using high performance computing to speed up their processing of enormous amount of input data. This includes large-scale parallel computations on massively parallel architectures as well as heterogeneous parallel computations using graphics processing units (GPUs).<br />
<br />
Applications of the aforementioned numerical methods for gravity field modelling involve a detailed discretization of the real Earth’s surface considering its topography. It naturally leads to the oblique derivative problem that needs to be treated. In case of FEM or FVM, unstructured meshes above the topography will be constructed. The meshless methods like MFS or SBM that are based on the point-masses modelling can be applied for processing the gravity gradients observed by the GOCE satellite mission. To reach precise and high-resolution solutions, an elimination of far zones’ contributions is practically inevitable. This can be performed using the fast multipole method or iterative procedures. In both cases such an elimination process improves conditioning of the system matrix and a numerical stability of the problem. <br />
The aim of the JSG is also to investigate and develop nonlinear filtering methods that allow adaptive smoothing, which effectively reduces the noise while preserves main structures in data. The proposed approach is based on a numerical solution of partial differential equations using a surface finite volume method. It leads to a semi-implicit numerical scheme of the nonlinear diffusion equation on a closed surface where the diffusivity coefficients depend on a combination of the edge detector and a mean curvature of the filtered function. This will avoid undesirable smoothing of local extremes.<br />
<br />
===Objectives===<br />
<br />
The main objectives of the study group are as follows:<br />
* to develop algorithms for detailed discretization of the real Earth’s surface including the possibility of adaptive refinement procedures,<br />
* to create unstructured meshes above the topography for the FVM or FEM approach,<br />
* to develop the FVM, BEM or FEM numerical models for solving the geodetic BVPs that will treat the oblique derivative problem,<br />
* to develop numerical models based on MFS or SBM for processing the GOCE observations,<br />
* to develop parallel implementations of algorithms using the standard MPI procedures,<br />
* to perform large-scale parallel computations on clusters with distributed memory,<br />
* to investigate and develop methods for nonlinear diffusion filtering of data on the Earth’s surface where the diffusivity coefficients depend on a combination of the edge detector and a mean curvature of the filtered function,<br />
* to derive the semi-implicit numerical schemes for the nonlinear diffusion equation on closed surfaces using the surface FVM,<br />
* and to apply the developed nonlinear filtering methods to real geodetic data.<br />
<br />
===Program of Activities===<br />
<br />
* Active participation at major geodetic workshops and conferences. <br />
* Organization of group working meetings at main international symposia.<br />
* Organization of conference sessions.<br />
<br />
===Members===<br />
<br />
'' '''Róbert Čunderlík (Slovakia), chair <br /> Karol Mikula (Slovakia), vice-chair''' <br /> Jan Martin Brockmann (Germany) <br /> Walyeldeen Godah (Poland) <br /> Petr Holota (Czech Republic) <br /> Michal Kollár (Slovakia) <br /> Marek Macák (Slovakia) <br /> <br />
Zuzana Minarechová (Slovakia) <br /> Otakar Nesvadba (Czech Republic) <br /> Wolf-Dieter Schuh (Germany) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=JSG_T.25&diff=512JSG T.252020-06-01T09:12:49Z<p>Pendl: </p>
<hr />
<div><big>'''JSG T.25: Advanced computational methods for recovery of high-resolution gravity field models'''</big><br />
<br />
Chairs: ''Robert Čunderlík (Slovakia)''<br><br />
Affiliation: ''Comm. 2 and GGOS''<br />
<br />
__TOC__<br />
<br />
===Introduction===<br />
<br />
Efficient numerical methods and HPC (high performance computing) facilities provide new opportunities in many applications in geodesy. The goal of the JSG is to apply numerical methods and/or HPC techniques mostly for gravity field modelling and nonlinear filtering of various geodetic data. The discretization numerical methods like the finite element method (FEM), finite volume method (FVM) and boundary element method (BEM) or the meshless methods like the method of fundamental solutions (MFS) or singular boundary method (SOR) can be efficiently used to solve the geodetic boundary value problems and nonlinear diffusion filtering, or to process e.g. the GOCE observations. Their parallel implementations and large-scale parallel computations on clusters with distributed memory using the MPI (Message Passing Interface) standards allows to solve such problems in spatial domains while obtaining high-resolution numerical solutions. <br />
<br />
Our JSG is also open for researchers dealing with the classical approaches of gravity field modelling (e.g. the spherical or ellipsoidal harmonics) that are using high performance computing to speed up their processing of enormous amount of input data. This includes large-scale parallel computations on massively parallel architectures as well as heterogeneous parallel computations using graphics processing units (GPUs).<br />
<br />
Applications of the aforementioned numerical methods for gravity field modelling involve a detailed discretization of the real Earth’s surface considering its topography. It naturally leads to the oblique derivative problem that needs to be treated. In case of FEM or FVM, unstructured meshes above the topography will be constructed. The meshless methods like MFS or SBM that are based on the point-masses modelling can be applied for processing the gravity gradients observed by the GOCE satellite mission. To reach precise and high-resolution solutions, an elimination of far zones’ contributions is practically inevitable. This can be performed using the fast multipole method or iterative procedures. In both cases such an elimination process improves conditioning of the system matrix and a numerical stability of the problem. <br />
The aim of the JSG is also to investigate and develop nonlinear filtering methods that allow adaptive smoothing, which effectively reduces the noise while preserves main structures in data. The proposed approach is based on a numerical solution of partial differential equations using a surface finite volume method. It leads to a semi-implicit numerical scheme of the nonlinear diffusion equation on a closed surface where the diffusivity coefficients depend on a combination of the edge detector and a mean curvature of the filtered function. This will avoid undesirable smoothing of local extremes.<br />
<br />
===Objectives===<br />
<br />
The main objectives of the study group are as follows:<br />
* to develop algorithms for detailed discretization of the real Earth’s surface including the possibility of adaptive refinement procedures,<br />
* to create unstructured meshes above the topography for the FVM or FEM approach,<br />
* to develop the FVM, BEM or FEM numerical models for solving the geodetic BVPs that will treat the oblique derivative problem,<br />
* to develop numerical models based on MFS or SBM for processing the GOCE observations,<br />
* to develop parallel implementations of algorithms using the standard MPI procedures,<br />
* to perform large-scale parallel computations on clusters with distributed memory,<br />
* to investigate and develop methods for nonlinear diffusion filtering of data on the Earth’s surface where the diffusivity coefficients depend on a combination of the edge detector and a mean curvature of the filtered function,<br />
* to derive the semi-implicit numerical schemes for the nonlinear diffusion equation on closed surfaces using the surface FVM,<br />
* and to apply the developed nonlinear filtering methods to real geodetic data.<br />
<br />
===Program of Activities===<br />
<br />
* Active participation at major geodetic workshops and conferences. <br />
* Organization of group working meetings at main international symposia.<br />
* Organization of conference sessions.<br />
<br />
===Members===<br />
<br />
'' '''Róbert Čunderlík (Slovakia), chair <br /> Karol Mikula (Slovakia), vice-chair''' <br /> Jan Martin Brockmann (Germany) <br /> Walyeldeen Godah (Poland) <br /> Petr Holota (Czech Republic) <br /> Michal Kollár (Slovakia) <br /> Marek Macák (Slovakia) <br /> <br />
Zuzana Minarechová (Slovakia) <br /> Otakar Nesvadba (Czech Republic) <br /> Wolf-Dieter Schuh (Germany) <br />''</div>Pendlhttp://icct.kma.zcu.cz/index.php?title=MediaWiki:Sidebar&diff=511MediaWiki:Sidebar2020-06-01T09:12:03Z<p>Pendl: </p>
<hr />
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