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Broad-band gravity field mapping by GOCE and airborne gravity

Rene Forsberg(1) and Arne Olesen(1)

(1) Danish National Space Center, Juliane Maries Vej 30, DK-2100 Copenhagen Oe, Denmark

Abstract

Airborne gravity, together with existing high-quality surface data and satellite altimetry gravity in the open ocean, may supplement GOCE to make a consistent high resolution global gravity field models up to very high resolutions (10 km or less). Current airborne gravity accuracies for long-range geodetic surveys are at the 1-2 mgal level, with no biases if properly processed and careful attention to base ties and instrument corrections. Airborne gravity may therefore extend the resolution of GOCE-derived gravity field models, and at the same time be most useful for checking and correcting errors in existing land and marine surface data. Coordinated airborne gravity surveys will also be a key to filling in the polar gaps of GOCE, especially in Antarctica, but also in parts of the Arctic where current gravity compilations still have systematic errors. In the paper we outline some recent results on large-scale continental and marine airborne gravity surveys, and illustrate errors in different wavelength bands by a.o. comparisons to GRACE data

 

Workshop presentation

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