Symposium GS001 Reference Frames.- Reference Systems, Reference Frames, and the Geodetic Datum.- Investigations into a Dynamic Geocentric Datum.- On the Strength of SLR Observations to Realize the Scale and Origin of the Terrestrial Reference System.- Impact of the Network Effect on the Origin and Scale: Case Study of Satellite Laser Ranging.- Satellite Laser Ranging Biases and Terrestrial Reference Frame Scale Factor.- Status of the European Reference Frame (EUREF).- Reprocessing of a Regional GPS Network in Europe.- Latest Enhancements in the Brazilian Active Control Network.- Searching for the Optimal Relationships Between SIRGAS2000, South American Datum of 1969 and Córrego Alegre in Brazil.- The Permanent Tide In Height Systems.- Combined Adjustment of National Astro-Geodetic Network and National GPS2000 Geodetic Network.- Symposium GS002 Gravity Field.- Improved Resolution of a GRACE Gravity Field Model by Regional Refinements.- The Role of the Atmosphere for Satellite Gravity Field Missions.- Assessment of GPS-only Observables for Gravity Field Recovery from GRACE.- Detecting the Baltic Sea Level Surface with GPS-Measurements and Comparing it with the Local Geoid Model.- Strengthening the Vertical Reference in the Southern Baltic Sea by Airborne Gravimetry.- Downward Continuation of Airborne Gravimetry and Gradiometry Data Using Space Localizing Spline Functions.- The Earth's Gravity Field Components of the Differences Between Gravity Disturbances and Gravity Anomalies.- Research on the Calibration of Onboard Accelerometer by Dynamic Method.- Current Status of Gravity Measurements in the Republic of Croatia with the Fundamental Gravity Network Finalization Project.- The Development of the European Gravimetric Geoid Model EGG07.- An Attempt for an Amazon Geoid Model Using Helmert Gravity Anomaly.- Combination of Gravimetry, Altimetry and GOCE Data for Geoid Determination in the Mediterranean: Evaluation by Simulation.- An Attempt Towards an Optimum Combination of Gravity Field Wavelengths in Geoid Computation.- BVP, Global Models and Residual Terrain Correction.- Domain Transformation, Boundary Problems and Optimization Concepts in the Combination of Terrestrial and Satellite Gravity Field Data.- Numerical Solution of the Fixed Altimetry-Gravimetry BVP Using the Direct BEM Formulation.- On the Combination of Gravimetric Quasi-Geoids and GPS-Levelling Data.- An Alternative Approach for the Determination of Orthometric Heights Using a Circular-Arc Approximation for the Plumbline.- On Evaluation of the Mean Gravity Gradient Within the Topography.- Comparison of Techniques for the Computation of a Height Reference Surface from Gravity and GPS-Levelling Data.- The Inversion of Poisson's Integral in the Wavelet Domain.- On the Principal Difficulties and Ways to Their Solution in the Theory of Gravitational Condensation of Infinitely Distributed Dust Substance.- Representation of Regional Gravity Fields by Radial Base Functions.- Precise Gravity Time Series and Instrumental Properties from Combination of Superconducting and Absolute Gravity Measurements.- On a Feasibility of Modeling Temporal Gravity Field Variations from Orbits of Non-dedicated Satellites.- EOF Analysis on the Variations of Continental Water Storage from GRACE in China.- Influence of Hydrology-Related Temporal Aliasing on the Quality of Monthly Models Derived from GRACE Satellite Gravimetric Data.- Image Super-Resolution via Filtered Scales Integral Reconstruction Applied to GOCE Geoid Data.- An Error Model for the GOCE Space-Wise Solution by Monte Carlo Methods.- Accuracy Analysis of External Reference Data for GOCE Evaluation in Space and Frequency Domain.- Gravity Field Determination at the AIUB - The Celestial Mechanics Approach.- Robust Trend Estimation from GOCE SGG Satellite Track Cross-Over Differences.- Reference Frame Consistency in CHAMP and GRACE Earth Gravity Models.- The Fast Analysis of the GOCE Gravity Field.- GRACE Application to the Receding