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Validation of GOCE Gravity Field Models

Thomas Gruber(1), Christian Ackermann(1), Martin Wermuth(1) and Pieter Visser(2)

(1) Technical University Munich, Arcisstrasse 21, 80333 Muenchen, Germany
(2) Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, Netherlands

Abstract

The GOCE High-level Processing Facility (HPF) will systematically generate global gravity field models from GOCE data applying different approaches. In order to identify the best performing solutions and in order to determine the overall quality of the final solutions an extensive validation of these models is performed before they will be released to the users as final GOCE level 2 products. For this a separate processing chain has been set up inside the HPF. The following techniques are applied for estimating the quality of the gravity field models: Orbit computation performance; Comparison to external gravity field information like geoid heights at GPS-levelling points or gravity anomalies; Comparisons of errors to signals on coefficient and degree variances level; Error propagation of full variance-covariance matrix to geoid height errors. All results of these test procedures are finally collected in a report attached to the final products. The paper provides examples for the test procedures showing results for simulated solutions as well as GRACE gravity field models.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry