Downward Continuation Of Airborne Gravity Data

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. ln the paper different operational methods based on collocation and FFT 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.

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