Bulletin des sciences géographiques de l'INCT
Volume 8, Numéro 2, Pages 2-7
2004-10-31

Downward Continuation Of Airborne Gravity Data



Authors : Forsberg Rene .

Abstract

With airborne gravimetry routinely reaching accuracies of 1-2 mGal at 5-10 km resolution, it is a challenge to perform a reliable downward continuation of the gravity anomalies at altitude. Airborne gravimetry is especially suited for geoid determination in mountainous and polar regions, due to the random, alias-free sampling of the terrain, relative to typical surface surveys. In the paper different operational methods based on collocation and FT are outlined, and applied to downward continuation of surface data merging of airborne surveys over Greenland and Svalbard, ranging in survey altitudes from 150 m to 4100 m.

Keywords

Airborne gravimetry, physical geodesy, harmonic downward continuation, geoid.

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