As part of the Greenland Ice-sheet Mapping Project (GIMP) we have produced three geospatial datasets for the entire ice sheet and periphery. These are (1) a complete, 15 m resolution image mosaic, (2) ice-covered and ice-free terrain classification masks, also posted to 15 m resolution and (3) a complete, altimeter-registered Digital Elevation Model posted at 30 m. The image mosaic was created from a combination of Landsat-7 and RADARSAT-1 imagery acquired between 1999 and 2002. Each pixel in the image is stamped with the acquisition date and geo-registration error to facilitate change detection. This mosaic was then used to manually produce complete ice-covered and ice-free land classification masks. Finally, we used satellite altimetry and stereo-photogrammetric DEMs to enhance an existing DEM for Greenland, substantially improving resolution and accuracy over the ice margin and periphery.
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Howat et al. (2014) studied this question.