Gravity, Geoid and Earth Observation IAG Commission 2: Gravity Field, Chania, Crete, Greece, 23-27 June 2008

These Proceedings include the written version of papers presented at the IAG International Symposium on "Gravity, Geoid and Earth Observation 2008". The Symposium was held in Chania, Crete, Greece, 23-27 June 2008 and organized by the Laboratory of Geodesy and Geomatics Engineering, Technical University of Crete, Greece. The meeting was arranged by the International Association of Geodesy and in particular by the IAG Commission 2: Gravity Field.

The symposium aimed at bringing together geodesists and geophysicists working in the general areas of gravity, geoid, geodynamics and Earth observation. Besides covering the traditional research areas, special attention was paid to the use of geodetic methods for: Earth observation, environmental monitoring, Global Geodetic Observing System (GGOS), Earth Gravity Models (e.g., EGM08), geodynamics studies, dedicated gravity satellite missions (i.e., GOCE), airborne gravity surveys, Geodesy and geodynamics in polar regions, and the integration of geodetic and geophysical information.

Gravimetry (Terrestrial, Shipborne, Airborne) and Gravity Networks.- Preliminary Results of a GPS/INS Airborne Gravimetry Experiment Over the German Alps.- Co-seismic Gravity Changes Computed for a Spherical Earth Model Applicable to GRACE Data.- On Ambiguities in Definitions and Applications of Bouguer Gravity Anomaly.- Harmonic Continuation and Gravimetric Inversion of Gravity in Areas of Negative Geodetic Heights.- Results of the European Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2007.- Aerogravity Survey of the German Bight (North Sea).- Results of the Seventh International Comparison of Absolute Gravimeters ICAG-2005 at the Bureau International des Poids et Mesures, Sèvres.- Post-Newtonian Covariant Formulation for Gravity Determination by Differential Chronometry.- Robust and Efficient Weighted Least Squares Adjustment of Relative Gravity Data.- Comparison Between GPS Sea Surface Heights, MSS Models and Satellite Altimetry Data in the Aegean Sea. Implications for Local Geoid Improvement.- First Experience with the Transportable MPG-2 Absolute Gravimeter.- Absolute Gravimetry at BIPM, Sèvres (France), at the Time of Dr. Akihiko Sakuma.- Correcting Strapdown GPS/INS Gravimetry Estimates with GPS Attitude Data.- Gravity Measurements in Panama with the IMGC-02 Transportable Absolute Gravimeter.- Comparison of Height Anomalies Determined from SLR, Absolute Gravimetry and GPS with High Frequency Borehole Data at Herstmonceux.- Vibration Rejection on Atomic Gravimeter Signal Using a Seismometer.- Gravity vs Pseudo-Gravity: A Comparison Based on Magnetic and Gravity Gradient Measurements.- Space-Borne Gravimetry: Present and Future.- Designing Earth Gravity Field Missions for the Future: A Case Study.- Regional Gravity Field Recovery from GRACE Using Position Optimized Radial Base Functions.- External Calibration of SGG Observations on Accelerometer Level.- Covariance Propagation of Latitude-Dependent Orbit Errors Within the Energy Integral Approach.- Future Mission Design Options for Spatio-Temporal Geopotential Recovery.- A Simulation Study Discussing the GRACE Baseline Accuracy.- GRACE Gravity Field Determination Using the Celestial Mechanics Approach – First Results.- Fast Variance Component Estimation in GOCE Data Processing.- Analysis of the Covariance Structure of the GOCE Space-Wise Solution with Possible Applications.- Earth Observation by Satellite Altimetry and InSAR.- Soil Surface Moisture From EnviSat RA-2: From Modelling Towards Implementation.- An Enhanced Ocean and Coastal Zone Retracking Technique for Gravity Field Computation.- Measurement of Inland Surface Water from Multi-mission Satellite Radar Altimetry: Sustained Global Monitoring for Climate Change.- ACE2: The New Global Digital Elevation Model.- Ocean Dynamic Topography from GPS – Galathea-3 First Results.- Filtering of Altimetric Sea Surface Heights with a Global Approach.- Coastal Sea Surface Heights from Improved Altimeter Data in the Mediterranean Sea.- On Estimating the Dynamic Ocean Topography – A Profile Approach.- Geoid Modeling and Vertical Datums.- Evaluation of the Topographic Effect using the Various Gravity Reduction Methods for Precise Geoid Model in Korea.- Analysis of Recent Global Geopotential Models Over the Croatian Territory.- On the Merging of Heterogeneous Height Data from SRTM, ICESat and Survey Control Monuments for Establishing Vertical Control in Greece: An Initial Assessment and Validation.- Implementing a Dynamic Geoid as a Vertical Datum for Orthometric Heights in Canada.- Evaluation of the Quasigeoid Models EGG97 and EGG07 with GPS/levelling Data for the Territory of Bulgaria.- Combination Schemes for Local Orthometric Height Determination from GPS Measurements and Gravity Data.- EUVN_DA: Realization of the European Continental GPS/leveling Network.- Analysis of the Geopotential Anomalous Component at Brazilian Vertical Datum Region Based on the Imarui Lagoon System.- Preliminary Results of Spatial Modelling of GPS/Levelling Heights: A Local Quasi-Geoid/Geoid for the Lisbon Area.- Physical Heights Determination Using Modified Second Boundary Value Problem.- Regional Gravity Field Modeling.- Impact of the New GRACE-Derived Global Geopotential Model and SRTM Data on the Geoid Heights in Algeria.- On Modelling the Regional Distortions of the European Gravimetric Geoid EGG97 in Romania.- Effect of the Long-Wavelength Topographical Correction on the Low-Degree Earth’s Gravity Field.- A Comparison of Various Integration Methods for Solving Newton’s Integral in Detailed Forward Modelling.- Further Improvements in the Determination of the Marine Geoid in Argentina by Employing Recent GGMs and Sea Surface Topography Models.- Comparison of Various Topographic-Isostatic Effects in Terms of Smoothing Gradiometric Observations.- Evaluation of Recent Global Geopotential Models in Argentina.- On the Determination of the Terrain Correction Using the Spherical Approach.- Smoothing Effect of the Topographical Correction on Various Types of the Gravity Anomalies.- Determination of a Gravimetric Geoid Model of Greece Using the Method of KTH.- Method to Compute the Vertical Deflection Components.- On Finite Element and Finite Volume Methods and Their Application in Regional Gravity Field Modeling.- Quasi-Geoid of New Caledonia: Computation, Results and Analysis.- Assessment of a Numerical Method for Computing the Spherical Harmonic Coefficients of the Gravitational Potential of a Constant Density Polyhedron.- Improving Gravity Field Modelling in the German-Danish Border Region by Combining Airborne, Satellite and Terrestrial Gravity Data.- An Inverse Gravimetric Problem with GOCE Data.- Global Gravity Field Modeling and EGMO8.- Assessment of the EGM2008 Gravity Field in Algeria Using Gravity and GPS/Levelling Data.- On High-Resolution Global Gravity Field Modelling by Direct BEM Using DNSC08.- Is Australian Data Really Validating EGM2008, or Is EGM2008 Just in/Validating Australian Data?.- Evaluation of EGM08 Using GPS and Leveling Heights in Greece.- Validation of the New Earth Gravitational Model EGM08 Over the Baltic Countries.- Evaluation of EGM2008 by Comparison with Global and Local Gravity Solutions from CHAMP.- Testing EGM2008 on Leveling Data from Scandinavia, Adjacent Baltic Areas, and Greenland.- Least Squares, Galerkin and BVPs Applied to the Determination of Global Gravity Field Models.- Temporal Gravity Changes and Geodynamics.- Terrestrial Water Storage from GRACE and Satellite Altimetry in the Okavango Delta (Botswana).- Greenland Ice Sheet Mass Loss from GRACE Monthly Models.- Water Level Temporal Variation Analysis at Solimões and Amazonas Rivers.- Spatiotemporal Analysis of the GRACE-Derived Mass Variations in North America by Means of Multi-Channel Singular Spectrum Analysis.- Analysing Five Years of GRACE Equivalent Water Height Variations Using the Principal Component Analysis.- Observed Gravity Change at Syowa Station Induced by Antarctic Ice Sheet Mass Change.- Evaluation of GRACE and ICESat Mass Change Estimates Over Antarctica.- Baltic Sea Mass Variations from GRACE: Comparison with In Situ and Modelled Sea Level Heights.- Water Storage in Africa from the Optimised GRACE Monthly Models: Iterative Approach.- Estimating Sub-Monthly Global Mass Transport Signals Using GRACE, GPS and OBP Data Sets.- Regular Gravity Field Variations and Mass Transport in the Earth System from DEOS Models Based on GRACE Satellite Data.- Estimating GRACE Monthly Water Storage Change Consistent with Hydrology by Assimilating Hydrological Information.- Secular Geoid Rate from GRACE for Vertical Datum Modernization.- Ten-Day Gravity Field Solutions Inferred from GRACE Data.- Earth Observation and the Global Geodetic Observing System (GGOS).- GGP (Global Geodynamics Project): An International Network of Superconducting Gravimeters to Study Time-Variable Gravity.- Surface Mass Loading Estimates from GRACE and GPS.- A Unified Approach to