Difference between revisions of "IC SG2"

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<big>'''Quality of geodetic multi-sensor systems and networks'''</big>
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<big>'''JSG 0.2: Gravity field modelling in support of world height system realization'''</big>
  
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Chair:''H. Kutterer (Germany)''<br>
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Chair:''P. Novák (Czech Republic)''<br>
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Affiliation:''Comm. 4, 1''
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Affiliation:''Comm. 2, 1 and GGOS''
  
 
__TOC__
 
__TOC__
 
===Introduction===
 
===Introduction===
  
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Modern geodetic observations are usually embedded in an integrated approach based on multi-sensor systems and networks. The fields of application are as manifold as the sensors in use. For example, total stations, GPS receivers and terrestrial laser scanners are applied in engineering geodesy for structural monitoring purposes together with permanently installed equipment. Geometric and physical space-geodetic sensors may serve as a second example since they are used for the determination of global reference frames.
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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.
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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.
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It is good geodetic tradition to assess the quality of the obtained results for further use and interpretation. However, each field of application provides its own quality standards which are to some extent incomplete regarding the immanent processes. At present, there is no general methodology available for the theoretically founded quality assessment of geodetic multi-sensor systems and networks and of the induced processes.
 
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The main focus of the SG is on the methodological foundation of quality in the context of close-range applications in engineering geodesy. Typical properties of the systems and networks considered here are on the one hand their readiness for real-time application and their adaptivity to observed system and process variations. On the other hand the systems and networks as well as their input are uncertain which limits analysis, interpretation and control. The IC SG2's work will cover at least three main fields in this context:
 
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* Identification and mathematical definition of the relevant process-related uncertainty and quality properties and models, propagation and inference,
 
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* revision, quality-related extension, and comparison of different approaches for the state space prediction and filtering (e.g., Kalman and shape filters, Bayesian filters, particle filters, fuzzy filters),
 
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* validation studies using applications of broader geodetic interest such as geodetic monitoring, mobile mapping, machine control.
 
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Comparable work outside geodesy both in the engineering and mathematical communities and in international standardization will be taken into account.
 
  
 
===Objectives===
 
===Objectives===
  
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The main objectives of the IC SG2 are
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* 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:
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* To study available gravity field models in terms of their available resolution, accuracy and stability for the pur-pose of WHS realization.
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* To define a role of a conventional model of the Earth’s gravity field (EGM) to be used for WHS realization in-cluding its scale parameters.
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* To study relations between an adopted conventional EGM and parameters of a geocentric reference ellipsoid of revolution approximating a time invariant equipoten-tial surface of the adopted EGM aligned to reduced observables of mean sea level.
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* To study theoretical aspects of various methods proposed for WHS definition and realization including investiga-tions on tidal system effects.
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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.
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* 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.
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* To study stable, accurate and efficient methods for con-tinuation of gravity field parameters including space-borne observables of type GRACE and GOCE.
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* To advance theory and methods for solving various initial and boundary value problems (I/BVP) in geodesy.
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* To study methods for gravity potential estimation based on its measured directional derivatives (gravity, gravity gradients) by exploiting advantages of simultaneous con-tinuation and inversion of observations.
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* To investigate requirements for gravity data (stochastic properties, spatially-temporal sampling, spectral content etc.) in terms of their specific geodetic applications.
  
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* to derive and promote a terminology and methodology for the quality assessment of geodetic multi-sensor systems and networks,
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===Program of Activities===
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* to provide a unique platform for quality-related issues in geodesy and neighbouring fields,
 
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* to initiate extended studies on related probabilistic and non-probabilistic methods for interpretation and decision,
 
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* to monitor parallel developments in other communities.
 
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To achieve these objectives, the IC SG 2 interacts and collaborates with the ICCT and its entities as well as the IAG Commissions 4 and 1.
 
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The SG's work will be distributed to IAG sister organizations through respective members.
 
  
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===Program of Activities===
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Active participation at major geodetic conferences and meetings.
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Organizing a session at the Hotine-Marussi Symposium 2013.
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Co-operation with affiliated IAG Commissions and GGOS.
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Electronic exchange of ideas and thoughts through a SG web page.
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Monitoring activities of SG members and external individuals related to SG.
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Compiling bibliography in the area of SG interest.
  
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The IC SG2s program of activities will include
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===Members===
  
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* organization of SG meetings and of a scientific workshop on quality issues
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'' '''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 />
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* participation in respective symposia,
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Christopher Jekeli (USA)<br />Dan Roman (USA)<br />Fernando Sansò (Italy)<br />Michael G Sideris (Canada)<br />Lars Sjöberg (Sweden)<br />
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* maintaining a website for quality-related information,
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Robert Tenzer (New Zealand)<br />Yan-Ming Wang (USA)<br />''
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* supporting contributions to the ICCT activities.
 

Revision as of 11:04, 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 pur-pose of WHS realization.
  • To define a role of a conventional model of the Earth’s gravity field (EGM) to be used for WHS realization in-cluding its scale parameters.
  • To study relations between an adopted conventional EGM and parameters of a geocentric reference ellipsoid of revolution approximating a time invariant equipoten-tial 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 investiga-tions 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 con-tinuation of gravity field parameters including space-borne 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 con-tinuation 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 SG web page. Monitoring activities of SG members and external individuals related to SG. Compiling bibliography in the area of SG 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)

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