Difference between revisions of "IC SG2"

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<big>'''JSG 0.11: Multiresolutional aspects of potential field theory'''</big>
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<big>'''IC-SG2: Quality of geodetic multi-sensor systems and networks'''</big>
  
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Chair:''Dimitrios Tsoulis (Greece)''<br>
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Chair:''H. Kutterer (Germany)''<br>
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Affiliation:''Comm. 2, 3 and GGOS''
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Affiliation:''Comm. 4, 1''
  
 
__TOC__
 
__TOC__
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===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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===Introduction===
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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 mathematical description and numerical computation of the gravity signal of finite distributions play a central role in gravity field modelling and interpretation. Thereby, the study of the field induced by ideal geometrical bodies, such as the cylinder, the rectangular prism or the generally shaped polyhedron, is of special importance both as fundamental case studies but also in the frame of terrain correction computations over finite geographical regions.
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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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Analytical and numerical tools have been developed for the potential function and its derivatives up to second order for the most familiar ideal bodies, which are widely used in gravity related studies. Also, an abundance of implementations have been proposed for computing these quantities over grids of computational points, elaborating data from digital terrain or crustal databases.
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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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Scope of the Study Group is to investigate the possibilities of applying wavelet and multiscale analysis methods to compute the gravitational effect of known density distributions. Starting from the cases of ideal bodies and moving towards applications involving DTM data, or hidden structures in the Earth's interior, it will be attempted to derive explicit approaches for the individual existing analytical, numerical or combined (hybrid) methodologies. In this process, the mathematical consequences of expressing in the wavelet representation standard tools of potential theory, such as the Gauss or Green theorem, involved for example in the analytical derivations of the polyhedral gravity signal, will be addressed. Finally, a linkage to the coefficients obtained from the numerical approaches but also to the potential coefficients of currently available Earth gravity models will also be envisaged.
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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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* Bibliographical survey and identification of multiresolutional techniques for expressing the gravity field signal of finite distributions.
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The main objectives of the IC SG2 are
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* Case studies for different geometrical finite shapes.
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* Comparison and assessment against existing analytical, numerical and hybrid solutions.
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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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* Computations over finite regions in the frame of classical terrain correction computations.
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* to provide a unique platform for quality-related issues in geodesy and neighbouring fields,
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* Band limited validation against available Earth gravity models.
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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.
  
 
===Program of Activities===
 
===Program of Activities===
  
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* Active participation at major geodetic meetings.
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The IC SG2s program of activities will include
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* Organize a session at the forthcoming Hotine-Marussi Symposium.
 
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* Compile a bibliography with key publications both on theory and applied case studies.
 
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* Collaborate with other working groups and affiliated IAG Commissions.
 
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===Members===
 
  
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'' '''Dimitrios Tsoulis (Greece), chair''' <br />Katrin Bentel (USA) <br /> Maria Grazia D'Urso (Italy) <br /> Christian Gerlach (Germany) <br /> Wolfgang Keller (Germany) <br /> Christopher Kotsakis (Greece) <br /> Michael Kuhn (Australia) <br /> Pavel Novák (Czech Republic) <br /> Konstantinos Patlakis (Greece) <br /> Clément Roussel (France) <br /> Michael Sideris (Canada) <br />Jérôme Verdun (France) <br /> Christopher Jekeli (USA) <br /> Frederik Simons (USA) <br /> Nico Sneeuw (Germany)''
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* organization of SG meetings and of a scientific workshop on quality issues
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* participation in respective symposia,
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* maintaining a website for quality-related information,
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* supporting contributions to the ICCT activities.

Revision as of 13:49, 22 April 2008

IC-SG2: Quality of geodetic multi-sensor systems and networks

Chair:H. Kutterer (Germany)
Affiliation:Comm. 4, 1

Introduction

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.

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.

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:

  • Identification and mathematical definition of the relevant process-related uncertainty and quality properties and models, propagation and inference,
  • 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),
  • validation studies using applications of broader geodetic interest such as geodetic monitoring, mobile mapping, machine control.

Comparable work outside geodesy both in the engineering and mathematical communities and in international standardization will be taken into account.

Objectives

The main objectives of the IC SG2 are

  • to derive and promote a terminology and methodology for the quality assessment of geodetic multi-sensor systems and networks,
  • to provide a unique platform for quality-related issues in geodesy and neighbouring fields,
  • to initiate extended studies on related probabilistic and non-probabilistic methods for interpretation and decision,
  • to monitor parallel developments in other communities.

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.

The SG's work will be distributed to IAG sister organizations through respective members.

Program of Activities

The IC SG2s program of activities will include

  • organization of SG meetings and of a scientific workshop on quality issues
  • participation in respective symposia,
  • maintaining a website for quality-related information,
  • supporting contributions to the ICCT activities.
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