It was in September 1906 that the predecessor of the IAG, the 'Internationale Erdmessung', th organized the 15 General Assembly at the Hungarian Academy of Sciences in Budapest. It was 95 years later, in September 2001, that the IAG returned to this beautiful city to hold its Scientific Assembly, IAG 2001, in the historical premises of the Academy. The meeting took place from September 2-7, 2001 and continued the tradition of Scientific Assemblies, started in Tokyo (1982) and continued in Edinburgh (1989), Beijing (1993) and Rio de Janeiro (1997). Held every four years at the midpoint between General Assemblies of the IAG, they focus on giving an integrated view of geodesy to a broad spectrum of researchers and practitioners in geodesy and geophysics. The convenient location of the main building of the Hungarian Academy in downtown Budapest and the superb efforts of the Local Organizing Committee contributed in a major way to the excellent atmosphere of the meeting. As at previous meetings, the scientific part of the program was organized as a series of symposia which, as a whole, gave a broad overview of actual geodetic research activities. To emphasize an integrated view of geodesy, the symposia did not follow the pattern of the IAG Sections, but focussed on current research topics to which several IAG Sections could contribute. Each symposium had 5 sessions with presented papers and poster sessions on two consecutive days.
Symposium A: Fine-tuning Reference Frame Implementation.- Activities of the International GPS Service (IGS) Reference Frame Working Group.- Extended Kalman Filtering for Combining Earth Rotation Parameters Time Series.- Gravity Model induced Systematic Errors in Reference Frames.- Recent Developments in Space VLBI Geodesy Demonstration Experiment (GEDEX).- Earth Orientation Parameters - Combination of Results Obtained by Different Techniques.- Geocenter Variations Derived From SLR Data to LAGEOS 1 and 2.- Dynamical Determination of Origin and Scale in the Earth System from Satellite Laser Ranging.- Status of the European Reference Frame - EUREF.- EPN Data and Product Analysis for Improved Velocity Estimation: First Results.- A Regional ITRF Densification by Blending Permanent and Campaign Data - The CEGRN campaigns and the Central European Velocity Field.- Using Double Difference Information from Network Solutions to Generate Observations for a Virtual GPS Reference Receiver.- Integration of a Regional GPS Network within ITRF Using Precise Point Positioning.- Hungary's New Gravity Base Network (MGH-2000) and It's Connection to the European Unified Gravity Net.- The European Vertical Reference System (EVRS), Its relation to a World Height System and to the ITRS.- A Reference Surface for the Unified Height System in the Northern Part of South America.- The Way to a Consistent National Height System for Switzerland.- Prospects for the Australian Height Datum and Geoid Model.- Local Effects in the Brazilian Vertical Datum.- Do We Need a New Reference System?.- Time Evolution of a World Geodetic Datum.- Is there a need for a Geodetic Datum 2000? Discussion of a "Heiskanen & Moritz' Proposition".- Symposium B: From Eoetvoes to Satellite Gradiometry - New Vistas in Measuring and Modeling the Earth's Gravity Field.- Fast Spherical Collocation: A General Implementation.- Principal Axes and Principal Moments of Inertia from Recent Satellite Gravity Field Solutions.- On the Use and Abuse of Helmert's Second Method of Condensation.- Combination of Gravity, Altimetry and GPS/Leveling Data for the Numerical Solution of Altimetry-Gravimetry Boundary Value Problems.- On the Inversion of GRACE Observables for Local Geoid Determination.- On the Potential of a Combined Use of CHAMP Star Tracking and Accelerometry.- Calibration and Error Assessment of GOCE Data.- On the Regularization Problem in Gravity Field Determination from Satellite Gradiometric Data.- Aliasing and Polar Gap Effects on Geopotential Coefficient Estimation: Space-wise Simulation Study of GOCE and GRACE.- Effects of Atmospheric Variations on the Marine Geoid Determined by Forthcoming Gravity Satellite.- Gravity Field Modelling by Torsion Balance Data - a Case Study in Hungary.- Estimating the Gravity Disturbance Vector from Airborne Gravimetry.- Error Sources in Airborne Gravimetry Employing a Spring-Type Gravimeter.- Improving DGPS Accelerations for Airborne Gravimetry: GPS Carrier Phase Accelerations Revisited.- Geoid Determination from Airborne Gravity Data Using Different Filtering Frequencies and DTM Resolutions.- Efficient Regional Geoid Computations from Airborne and Surface Gravimetry Data: A Case Study.- Airborne Laser and Interferometric SAR for Mapping Heights of Glaciers and Sea-Ice.- Validation and Error Correction of Space-Derived Digital Elevation Models Using ERS Satellite Altimeter Data.- A Comparison of Direct and Indirect Numerical Methods for the Downward Continuation of Airborne Gravity Data.- On the Iterative Solution of Ill-Conditioned Normal Equations by the Use of Lanczos Methods.- The Performance of the Time-wise Semi-Analytical Inversion of Satellite Gravity Gradients.- A Simple and Stable Approach to High Degree and Order Spherical Harmonic Synthesis.- A Wavelet Approach for the Construction of Multi-Grid Solvers for Large Linear Systems.- Symposium C: Geometry and Beyond - Using Global Navigation Satellite Systems in New Ways.- GPS Radio Occultation with CHAMP: First Results and Status of the Experiment.- GNSS Radio Occultations for Climate Applications: a Benchmark with Spaceborne Nadir Sounders.- On the Specific Aspects of Precise Tropospheric Path Delay Estimation in GPS Analysis.- Ionospheric Effects During a Geomagnetic Storm.- Exploitation of Ground Based GPS for Numerical Weather Prediction and Climate Applications in Europe.- Kinematic Orbit Determination for Low Earth Orbiters (LEOs).- Analysis of the Earth's Gravitational Field from Semi-Continuous Ephemeris of a Low Earth Orbiting GPS-Tracked Satellite of Type CHAMP, GRACE or GOCE.- GPS/LEO Rapid Orbit Determination in Support of GPS Meteorology: Status and Future Plans.- Kinematic Orbit Determination of LEOs Based on Zero or Double-Difference Algorithms Using Simulated and Real SST GPS Data.- Network Optimization with respect to Systematic Errors.- High-Precision Integrated GPS/INS/CCD System for Transportation Applications.- Principal Component Analysis of Wavelet Transformed GPS Data for Deformation Monitoring.- The Use of GPS for Monitoring Cable-Stayed Bridges in Seismic Areas.- Multi-Applications of GPS for Hydrographic Surveys.- New Challenges in Connection with GPS Precise Positioning.- SIGMA-F: Variances of GPS Observations Determined by a Fuzzy System.- Querying Raster Data Structures - Probabilistic and Non-probabilistic Approaches On Knowledge Based Template Matching Methods.- BLIMPBE and its Geodetic Applications.- A Comparison Between Statistical & Fuzzy Techniques in Outlier Detection.- On the Periodicity of GPS Time Series.- Modernised GPS: Phase-only Integer Ambiguity Estimability in the Presence of Ionospheric Delays.- Detection and Mitigation of Static Multipath in L1 Carrier Phase Measurements Using a Dual-Antenna Approach.- A Statistical Test Procedure for the Detection and Identification of GPS Systematic Errors.- Modelling Residual Systematic Errors in GPS Positioning: Methodologies and Comparative Studies.- Symposium D: Modeling Earth Processes and Global Change.- Complex Interpretation of the Earth Despinning History.- The "Hidden Torque": the Art, for a Torque, to Dominate Everywhere and Appear in No Equation.- Climate Excitation of Polar Motion.- Oceanic Excitation of the Chandler Wobble Using a 50-Year Time Series of Ocean Angular Momentum.- Analysis of the EOPs from Independent Parallel VLBI Sessions.- Analysis of Rapid Variations of Polar Motion Determined by GPS.- Improvement of the Earth Nutation Theory by Taking into Account the Atmosphere and Viscosity of the Liquid Core.- Modulation of the Seasonal Cycle in Length-of-Day and Atmospheric Angular Momentum.- Numerical Solutions for the Non-Linear Liouville Equation.- Subdiurnal Earth Orientation Parameters from VLBI Networks - Determinability and Significance.- Investigation of Sea Level Variations at Two Tide Gauges in Bulgaria.- Seasonal and Low-Frequency Variability in Basin-Scale Sea Level.- Sea Level Variations in the North Atlantic.- Sea-Level Variations in the Baltic Sea: Consistency of Geodetic Observations and Oceanographic Models.- Bias in Geodetic Site Velocity due to Annual Signals: Theory and Assessment.- NW Bulgaria - The Northern Boundary of the Aegean Extensional Domain.- Near-Field Deformation of the Imperial Valley, Southern California, from GPS and InSAR Measurements.- Recent Crustal Deformation and Strain Accumulations in Continental China Inferred from GPS and Seismicity Data.- Far-Field Deformation due to Volcanic Activity and Earthquake Swarm.- Inverse Barometer Coefficients Obtained at Short Time-Scales from ERS Tandem Mission Altimeter Data.- Improving the Estimation of Bottom Ocean Topography with Altimetry Derived Gravity Data Using the Integrated Inverse Method.- Estimating Altimetry 5?x5? Mean Gravity Anomaly Regional Accuracies.- Earth's Dimension Specified by Geoidal Geopotential.- Analysis of Poseidon and ERS-2 Satellite Radar Altimeter Waveform Data around Australian Coasts.- Spatial Correlation Between Regional Long-Term Changes in sea Level and sea Surface Temperature.- Special Sessions.- Long-Term Cooperation in Geodesy and Geodynamics of CEI Countries. Experiences and Results.- The Cooperation of the Scientific Institutions of the Former Socialist Countries in Central and Eastern Europe in the Field of Geodesy and Some Result.- Scientific Cooperation of the Central and Eastern European Countries (CEEC) and the Hungarian Geodetic Control Nets.- Site Velocities Obtained from Central Europe Regional Geodynamics Project and their Interpretation in Form of Surface Deformations.- Space Geodesy and Earth Sciences.- Interdisciplinary Space Geodesy: Challenges in the New Millennium.- The Greening of Geodetic Theory.- The IAG-REVIEW 2000-2001: Executive Summary.- Integrated Global Geodetic Observing System (IGGOS): A Candidate IAG Project.- Author Index.- Keyword Index.
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