Difference between revisions of "IC SG2"
(→Program of Activities) |
(→Objectives) |
||
(One intermediate revision by the same user not shown) | |||
Line 17: | Line 17: | ||
* To study relations between an adopted conventional EGM and parameters of a geocentric reference ellipsoid of revolution approximating a time invariant equipotential surface of the adopted EGM aligned to reduced observables of mean sea level. | * To study relations between an adopted conventional EGM and parameters of a geocentric reference ellipsoid of revolution approximating a time invariant equipotential surface of the adopted EGM aligned to reduced observables of mean sea level. | ||
* To study theoretical aspects of various methods proposed for WHS definition and realization including investigations on tidal system effects. | * To study theoretical aspects of various methods proposed for WHS definition and realization including investigations on tidal system effects. | ||
− | To investigate combination of heterogeneous gravity field observables by using spatial inversion, spherical radial functions, collocation, wavelets, etc. and by taking into account their sampling geometry, spectral and stochastic properties. | + | * To investigate combination of heterogeneous gravity field observables by using spatial inversion, spherical radial functions, collocation, wavelets, etc. and by taking into account their sampling geometry, spectral and stochastic properties. |
* To investigate methods of gravity field modelling based on combination of global gravitational models, ground and airborne gravity, GNSS/levelling height differences, altimetry data, deflections of the vertical, etc. | * To investigate methods of gravity field modelling based on combination of global gravitational models, ground and airborne gravity, GNSS/levelling height differences, altimetry data, deflections of the vertical, etc. | ||
* To study stable, accurate and efficient methods for continuation of gravity field parameters including spaceborne observables of type GRACE and GOCE. | * To study stable, accurate and efficient methods for continuation of gravity field parameters including spaceborne observables of type GRACE and GOCE. | ||
Line 35: | Line 35: | ||
===Members=== | ===Members=== | ||
− | '' '''Pavel Novák (Czech Republic), chair'''<br />Hussein Abd-Elmotaal (Egypt)<br />Robert Čunderlík (Slovakia)<br />Heiner Denker (Germany)<br />Will Featherstone (Australia)<br />René Forsberg (Denmark)<br />Bernhard Heck (Germany)<br />Jianliang Huang (Canada)<br /> | + | '' '''Pavel Novák (Czech Republic), chair'''<br />Hussein Abd-Elmotaal (Egypt)<br />Robert Čunderlík (Slovakia)<br />Heiner Denker (Germany)<br />Will Featherstone (Australia)<br />René Forsberg (Denmark)<br />Bernhard Heck (Germany)<br />Jianliang Huang (Canada)<br />Christopher Jekeli (USA)<br />Dan Roman (USA)<br />Fernando Sansò (Italy)<br />Michael G Sideris (Canada)<br />Lars Sjöberg (Sweden)<br /> Robert Tenzer (New Zealand)<br />Yan-Ming Wang (USA)<br />'' |
− | Christopher Jekeli (USA)<br />Dan Roman (USA)<br />Fernando Sansò (Italy)<br />Michael G Sideris (Canada)<br />Lars Sjöberg (Sweden)<br /> | ||
− | Robert Tenzer (New Zealand)<br />Yan-Ming Wang (USA)<br />'' |
Revision as of 11:08, 2 July 2012
JSG 0.2: Gravity field modelling in support of world height system realization
Chair:P. Novák (Czech Republic)
Affiliation:Comm. 2, 1 and GGOS
Introduction
Description of the Earth’s gravity field still remains a major research topic in geodesy. The main goal is to provide reliable global models covering all spatially-temporal frequencies of its scalar parameterization through the gravity potential. Detailed and accurate gravity field models are required for proper positioning and orientation of geodetic sensors (data geo-referencing). Geometric properties of the gravity field are then studied including those of its equipotential surfaces and their respective surface normals, since they play a fundamental role in definition and realization of geodetic reference systems. Gravity field models will be applied for definition and realization of a vertical reference system (currently under construction) that will support studies of the Earth system. This study group is an entity of the Inter-Commission Committee on Theory. It is affiliated to Commissions 1 (Reference Frames) and 2 (Gravity Field); its close co-operation with GGOS Theme 1 “Unified Global Height System” is anticipated. It aims at bringing together scientists concerned namely with theoretical aspects in the areas of interest specified below.
Objectives
- Considering different types and large amounts of gravity-related data available today, large variety of gravity field models and the ongoing IAG project of realizing a world height system (WHS), this study group shall focuses on theoretical aspects related to the following (non-exhaustive to WHS) list of problems:
- To study available gravity field models in terms of their available resolution, accuracy and stability for the purpose of WHS realization.
- To define a role of a conventional model of the Earth’s gravity field (EGM) to be used for WHS realization including its scale parameters.
- To study relations between an adopted conventional EGM and parameters of a geocentric reference ellipsoid of revolution approximating a time invariant equipotential surface of the adopted EGM aligned to reduced observables of mean sea level.
- To study theoretical aspects of various methods proposed for WHS definition and realization including investigations on tidal system effects.
- To investigate combination of heterogeneous gravity field observables by using spatial inversion, spherical radial functions, collocation, wavelets, etc. and by taking into account their sampling geometry, spectral and stochastic properties.
- To investigate methods of gravity field modelling based on combination of global gravitational models, ground and airborne gravity, GNSS/levelling height differences, altimetry data, deflections of the vertical, etc.
- To study stable, accurate and efficient methods for continuation of gravity field parameters including spaceborne observables of type GRACE and GOCE.
- To advance theory and methods for solving various initial and boundary value problems (I/BVP) in geodesy.
- To study methods for gravity potential estimation based on its measured directional derivatives (gravity, gravity gradients) by exploiting advantages of simultaneous continuation and inversion of observations.
- To investigate requirements for gravity data (stochastic properties, spatially-temporal sampling, spectral content etc.) in terms of their specific geodetic applications.
Program of Activities
Active participation at major geodetic conferences and meetings. Organizing a session at the Hotine-Marussi Symposium 2013. Co-operation with affiliated IAG Commissions and GGOS. Electronic exchange of ideas and thoughts through a JSG web page. Monitoring activities of SG members and external individuals related to JSG. Compiling bibliography in the area of JSG interest.
Members
Pavel Novák (Czech Republic), chair
Hussein Abd-Elmotaal (Egypt)
Robert Čunderlík (Slovakia)
Heiner Denker (Germany)
Will Featherstone (Australia)
René Forsberg (Denmark)
Bernhard Heck (Germany)
Jianliang Huang (Canada)
Christopher Jekeli (USA)
Dan Roman (USA)
Fernando Sansò (Italy)
Michael G Sideris (Canada)
Lars Sjöberg (Sweden)
Robert Tenzer (New Zealand)
Yan-Ming Wang (USA)