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Geology -- Greenland.

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View Resource Greenland 5 km DEM, Ice Thickness, and Bedrock Elevation Grids

The National Snow and Ice Data Center (NSIDC) has recently released a digital elevation model (DEM), ice thickness data taken by airborne ice penetrating radar, and bedrock thickness data (ice thickness subtracted from DEM) for 5 km of Greenland. The data are in ASCII format, and documentation (data collection, application, terminology, etc.) is available at the site.

http://nsidc.org/data/nsidc-0092