This data situation has in the later years changed substantially, first of all due to GOCE, but also new airborne gravity and ice thickness data from the NASA IceBridge mission, and new terrain models from ASTER, SPOT-5 and digital photogrammetry. Terrestrial gravity coverage has for the same reasons been relatively sparse, with an older airborne survey of the interior being the only gravity field data over the interior, and terrain and ice thickness models being insufficient both in terms of resolution and accuracy. Making an accurate geoid model of Greenland has always been a challenge due to the ice sheet and glaciers, and the rough topography and deep fjords in the ice free parts.
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