The DNSC05 high-resolution global marine gravity field.
Ole Andersen(1) , Per Knudsen(2) , Philippa Berry(3) , Steve Kenyon(4) , and Per Knudsen(2)
Danish National Space Center,
Juliane Maries Vej 30,
Dk-2100 Copenhagen O,
(2) DNSC, Juliane Maries Vej 30, DK-2100 Copenhagen 0, Denmark
(3) De Montford University, The Arch, Leiceister, UK
(4) National Geospatial-intelligence Agency, St Louis, Arnott, MO, United States
The latest version (DNSC05) of the formerly KMS global marine gravity fields is presented, This gravity field has a resolution of 1 minute by 1 minute and covers all marine regions of the world including the Arctic Ocean up to the North Pole. 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.