Geodesy on the Move

Based on the IAG scientific assembly in Rio de Janeiro, Brazil, this volume combines papers in the fields of gravity and geoid, geodynamics, and geodesy in Antarctica. The volume contains papers on recent progress in absolute and relative gravimetry, on models of the global gravity field, theoretical developments in physical geodesy, and many examples of regional gravity field and geoid models. Geodynamics chapters include papers on earth rotation and geopotential variations, reference frames and global deformations, as well as a section on the combination of space and terrestrial methods for deformation observations. The current status of geodesy in Antarctica is illustrated by a number of papers describing large-scale and local observation campaigns, the establishment of fundamental geodetic reference stations, and the utilization of new techniques such as SAR interferometry.

Contenu

Gravity and Geoid.- Developments in static and kinematic gravimetry Convenor.- The changing role of gravity reference networks.- Improving accuracy and reliability of airborne gravimetry by multiple system configurations.- Combining airborne and ground gravity using collocation.- Comparisons between absolute (AG) and superconducting (SG) gravimeters.- An airborne geoid mapping system for regional sea-surface topography: application to the Skagerrak and Azores areas.- The German gravity base net 1994 (DSGN 1994).- SAR Interferometry for improved terrain corrections in surface and airborne gravimetry.- National gravimetric network of Uruguay.- Global gravity field from gravimetry and satellite altimetry Convenors.- Past and future developments in geopotential modelling.- The world of gravity according to Rapp.- Gravity field improvement activities at NASA GSFC.- The development by the National Imagery and Mapping Agency of a global surface gravity anomaly database for the EGM96 geopotential model and future applications.- On the possibility to estimate ocean bottom topography from marine gravity and satellite altimeter data using collocation.- Generating orthometric heights from the ERS-1 altimeter geodetic mission dataset: results from an expert systems approach.- Use of ERS-1 land altimetry to validate the Globe global digital elevation model.- Geodetic application of ERS-1 altimeter data over land.- Global marine gravity and mean sea surface from multimission satellite altimetry.- Sea level variations measured by TOPEX/POSEIDON and by tide gauges: a validation study in the southern Baltic Sea.- Observed inconsistencies between satellite-only and surface gravity-only geopotential models.- A comparison of satellite altimetry methods for the recovery of gravity field quantities.- Gravity determination in ice covered regions by altimetry.- The geoid - theory and methods Convenor.- A priori estimates of the solution of the geodetic boundary value problem.- Application of multiresolution filtering in geoid determination.- Geoid computation by collocation in scaling spaces.- An efficient technique for the computation of the gravimetric quantities from geopotential earth models.- Modified kernels in spectral geoid determination - first results from Western Australia.- Geoids and cap sizes.- The effects of varying cap sizes on geoid computations - experiences with FFT and ring integration.- A comparison of techniques for the integration of satellite altimeter and surface gravity data for geoid determination.- Application of spherical wavelets for regional gravity field recovery - a comparative study.- Comments on two dimensional convolutions of the geodetic problems in planar and spherical coordinates.- Overdetermined gravity gradiometry boundary value problem: theory and simulation.- Investigations on the earth's relativistic gravity field.- Geoid and mass density - why and how?.- Operational merging of satellite, airborne and surface gravity data by draping techniques.- Regional geoids and the gravity field of South America Convenors.- The European gravimetric quasigeoid EGG97 - an IAG supported continental enterprise.- A preliminary geoid model for Argentina.- The gravimetric geoid in Algeria: first results.- Geoid studies in the north-east Atlantic (Azores-Portugal).- The gravimetric geoid for Libya.- Comparison between altimetric and gravimetric geoid in the south-west Meditterranean basin.- Data, processing for a geoid model in Argentina.- Decimetric geoid for Buenos Aires province based on GPS and global models.- Towards a regional geoid determination in western Venezuela.- Improved gravimetric geoid AGG97 of Austria.- Geodynamics.- Earth rotation and variations of the geopotential Convenors.- Metrology of the Earth's rotation over 1988-1997.- Earth orientation parameter analysis from VLBI data.- Tempo: determining, combining, and predicting earth orientation parameters for space craft navigation.- Possible temporal variations of the free core nutation and forced nutations.- Excitation of nutation as deduced from results of the recent atmospheric reanalysis project.- Regional atmospheric angular momentum contributions to the polar motion excitation.- Time-frequency characteristics of the pressure term of the EAAM excitation functions in some geographic regions.- The spacetime gravitational field of a deformable body.- Temporal variation of the geopotential: processes and interactions among the Earth's subsystems.- Monitoring geoidal potential on the basis of Topex/Poseidon altimeter data and EGM96.- Reference frames and global deformations Convenor.- Absolute positioning, tectonic plate motions and polar motion determination with the DORIS system.- Geodetic baseline adjustment by VLBI technique.- Adjustment of a European combined GPS-SLR-VLBI fundamental network.- Combination of VLBI, SLR and GPS determined station velocities for actual plate kinematic and crustal deformation models.- Geodesy demonstration experiment (GEDEX) for space VLBI: state of the art and software development.- An integrated crustal movement monitoring network in China.- VLBI, SLR and GPS observations in the Key Stone Project.- Cooperation of the sixteen CEI (Central European Initiative) countries in geodesy and geodynamics.- No relative movements between South America and Scotia plates in Tierra del Fuego.- A numerical model for the study of the load effect of the water in the area of the river Plate.- Crustal deformation along the Caribbean-South American plate boundary derived from the CASA GPS project.- The Aqaba earthquake of November 22, 1995 and co-seismic deformation in Sinai Peninsula, deduced from repeated GPS measurements.- Fault model of the 1995 north Sakhalin earthquake based on SAR interferogram.- Integration of GPS Algerian sites in west Mediterranean geodynamical studies - case of TYRGEONET project.- Combination of space observations with other observations of deformations Convenors.- Multi-parametric experiment for observing crustal deformations in southern Brazil.- The determination of motion rates of blocks in Qinghai-Tibet plateau by GPS measurements.- Detection of crustal deformations by SAR interferometry in combination with dense GPS array.- Modelling vertical crustal deformation in time and position domains, inferred from GPS levelling.- Comparison of crustal deformations observed with GPS and strainmeters/tiltmeters.- Present-day kinematics of central Asia derived by joint inversion of geological and geodetic data.- Application of the anomaly of astrometric observations to earthquke prediction study.- Interdisciplinary studies of astronomical factors and earthquakes in China.- Geodesy in Antarctica.- Geodesy in Antarctica Convenor.- The ice-age geodynamics of Antarctica.- Elevation changes in Antarctica 1992-1996: implications for ice sheet mass balances.- The SCAR GPS campaigns: accurate geodetic reference in Antarctica.- Uruguayan contribution to the Antarctic geodesy.- GPS for ice sheet movement monitoring and grounding line detection.- Comparison of al…