Towards an Integrated Global Geodetic Observing System (IGGOS)

The international symposium Towards an Integrated Global Geodetic Observing System was an initiative of section II Advanced Space Technology of the International Association of Geodesy (lAG). Ittook place in the building ofthe Bavarian Academy of Sciences in Munich from October 5 -9, 1998. About 130 scientists from 24 countries participated in the symposium. It was organized jointly by the Deutsches Geodatisches F orschungsinstitut and the Institut fUr Astronomische und Physikalische Geodasie/Technische Universitat MUnchen. The objective of the symposium was an analysis of the state-of-art of geodetic space techniques and an outlook into the possibility of the establishment of a global integrated observing system. In view of the fact that most geodetic space techniques have reached or approach the one part per billion relative precision level the question arises what their j oint and coordinated operation could offer to the study of system Earth. For this purpose the symposium was divided into four themes, i. e. reference system and datum integration, strength and weakness of space techniques, upcoming gravity field satellite missions, and implications for Earth sciences. Each of these themes was addressed by invited lectures of prominent scientists with sufficient time left for discussion. The oral sessions were complemented by poster sessions. A panel discussion at the closing session completed the program.

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The international symposium, "Towards an Integrated Global Geodetic Observing System", held in Munich 5-9 October 1998, analysed the state of the art of geodetic space techniques and looked into the possibility of the establishment of an integrated global observing system. Considering that most geodetic space techniques have reached or approached the one part per billion relative precision level, the question is what their joint and coordinated operation could offer to the study of the Earth system. The symposium was divided into four topics: (1) reference system and datum integration; (2) strength and weakness of space techniques; (3) upcoming gravity field satellite missions; (4) implications for Earth sciences.

Contenu
Position Papers.- Importance of a Common Framework for the Realization of SpaceTime Reference Systems.- The Use of a Precise Reference Frame in Sea Level Change Studies.- Combination of Space Techniques into one Integrated Processing Model.- Towards an Integrated Global Reference System: Geodesy as a Utility.- Space Techniques and their Coordination within IAG at Present and in Future.- Contributions of VLBI to Space Geodesy.- Towards an Integrated Global Geodetic Observing System.- Envisaging a new era of gravity field research.- Status of the CHAMP Mission.- Satellite Gravity Gradiometry with GOCE.- Integration of geodetic techniques into a global Earth monitoring system and its implication for Earth system sciences.- The Integration of Geodetic Measurements into an Earth Science Observing Program: The Example of Glacial Rebound.- Posters Session A: Reference System and Datum Integration.- Quality Analysis of some IGS Weekly Combined Solutions with Respect to ITRF.- Geosat and ERS-1 Datum Offsets Relative to Topex/Poseidon Estimated Simultaneously with Geopotential Corrections from MultiSatellite Crossover Altimetry.- The Integration of Brazilian Geodetic Network into SIRGAS Preliminary Results.- Construction of the New Japan Datum Using Space Geodetic Technologies.- Deviation of Japanese Vertical Datum and Reference Surface with Respect to the Global Geoid.- Reference Systems Used in Global Navigation Satellite Systems.- Recent Contribution to the ITRF and its Realization in Canada.- Realization and Unification of NAD83 in Canada and the U.S. via the ITRF.- Geodetic Datum Definition of the SAGA Network.- Weak Gravitational Lensing and Instability of the Celestial Reference Frame.- Height Time Series of the Italian GPS Fiducial Network compared with VLBIand SLR Estimations.- Monitoring the Continental Reference Frame in South America.- World Geodetic Datum 2000.- Posters Session B: Strengths and Weaknesses of Space Techniques.- Validation of TOPEX/POSEIDON Measurements in the Southern Baltic Sea.- DORIS: Contribution of an Orbit Determination System to Accurate and Long Term Altimetry from Space.- IGS Combinations of Polar Motion, Length of Day and Universal Time.- Comparison of Site Velocities Measured by VLBI and GPS in the Key Stone Project Network.- Large Lunar Laser Ranging at its Best.- Combining GPS and CCD to Modernise Astronomical Levelling.- Orbit Modelling Based on Laser and CCD-Observations.- Unification of the GPS Work in Egypt.- Earth Orientation Parameters Measured by Space Geodesy Techniques.- New Method for the Selection of Additional Sites for the Homogenisation of an Inhomogeneous Cospherical Point Distribution.- Westford VLBI to GPS Vertical Tie and Implications for the TRF.- Posters Session C: Upcoming Gravity Field Satellite Missions.- Impact of terrestrial data on future satellite gravity field solutions.- SAGE: An Italian Project of Satellite Accelerometry.- Accelerometry Aboard CHAMP.- Simulation of the GOCE Gravity Field Mission.- Fundamentals and Applications of the Gravity Field Mission GOCE.- Effects of Inhomogeneous Data Coverage on Spectral Analysis.- Geodetic Applications of the ROCSAT-3/COSMIC Mission.- Estimation of Ocean Mass Redistribution by Means of Altimetry and Circulation Models and its Impact on the Gravity Field.- GFZ and DLR Contribution to a GPS Ground Network to Support the CHAMP Mission.- The ESA Gravity Field and Steady-State Ocean Circulation Explorer Mission: Impact on Solid Earth Physics.- Posters Session D: Implication for Earth Sciences.- The RegularCharacter of the Plate Motion: Implication for Earth Sciences.- About Global Rotation of the Lithosphere.- Least Squares Collocation Method for Space Geodetic Data Analysis.- BIFROST Project: Studies of Variations of Absolute Sea Level in Conjunction with the Postglacial Rebound of Fennoscandia.- The Indonesian Gravity Field and the Geoid Model.- ISRO Initiatives for Space Geodesy and Geodynamics in India.- A Sketch towards an Integrated Global Geodetic Observing System (IGGOS).- Global Integrated Geodetic and Geodynamic Observing System (GIGGOS).- Authors' Index.