Tuesday 23 August 2005

G2
1330-1525 hours

171
The DNSC05 high resolution global marine gravity field, mean sea surface and bathymetry
Andersen, Ole B.¹, Knudsen, Per¹, Kenyon, Steve², Berry, Philippa³, Pavlis, Nikolas⁴
1 Danish National Space Center, Copenhagen, Denmark
2 National Geospatial-intelligence Agency, Arnott, St Louis, Mo, USA
3 De Montfort University, Leicester, UK
4 Raytheon ITSS, Greenbelt, MD, USA
Author email: oa@spacecenter.dk
The latest version (DNSC05) of the global marine gravity fields, mean sea surface and bathymetry is presented. This gravity field has a resolution of 1 minute by 1 minute and covers all marine regions og the world including the Arctic Ocean. By starting out from the original waveform data and retracking the entire ERS-1 GM mission using a highly advanced expert based system of multiple retrackers the return time from both the open sea surface and from all ice-covered regions within the coverage of the ERS-1 can be derived with higher accuracy that presently available. This presentation describes the combined effort in improving the ERS-1 GM dataset through retracking and regression to 2 Hz (3 km) and its effect on gravity field modeling close to the coast. Extensive comparisons carried out at the National Geospatial-Intelligence Agency is also presented to document the findings.

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