Airborne Gravimetry for Geoid and GOCE
DTU-Space has since 1996 carried out large area airborne surveys over both polar, tropical and temperate regions, especially for geoid determination and global geopotential models. Recently we have started flying two gravimeters (LCR and Chekan-AM) side by side for increased reliability and redundancy. Typical gravity results are at the 2 mGal rms level, translating into 5–10 cm accuracy in geoid. However, in rough mountainous areas results can be more noisy, mainly due to long-period mountain waves and turbulence. In the paper we outline results of surveys and recent geoid determinations in Antarctica and Tanzania based on DTU-Space aerogravity and GOCE. In both cases the airborne data validate GOCE to very high degrees, and confirms the synergy of airborne gravity and GOCE. For Antarctica, the deep interior Antarctic survey (continued in 2013 from a remote field camp), shows that it is possible efficiently to cover even the most remote regions on the planet with good aerogravity. With the recent termination of the GOCE mission, it is therefore timely to initiate a coordinated, preferably international, airborne gravity effort to cover the polar gap south of 83° S; such a survey can in principle logistically be done in a single season.
KeywordsAirborne gravity Geoid GOCE Gravimeter
The survey costs for Antarctica were sponsored by NGA, ESA and DTU Space, and for Tanzania by the Department of Survey, Tanzania, the World Bank and NGA. The Antarctica operations where carried out in cooperation with British Antarctic Survey, the Norwegian Polar Institute, and the University of Texas at Austin.
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