Validation Concepts for Gravity Field Models from New Satellite Missions
نویسنده
چکیده
The new satellite missions CHAMP, GRACE and GOCE will provide significantly improved global gravity field information in terms of quality and spatial resolution. In order to quantify the quality of these gravity field models independently from the estimation procedure, new validation concepts are necessary using external information. Validation requires the processing of selected level 3 products from the satellite gravity missions, which further-on can be compared to independent data. A typical example of such an approach is the determination of the stationary sea surface topography using the geometric approach (mean sea surface minus the geoid) and comparison to oceanographically derived solutions. The paper summarises procedures for validation of gravity field models on different data levels and provides samples of validation results for the latest CHAMP and GRACE fields.
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