USGS 7.5-Minute Native Format - United States

The 7.5-min USGS DEMs have been converted from the SDTS format to the native DEM format using the corrected SDTS2DEM conversion software produced by Dr. Gregg Townsend of the University of Arizona.

The 7.5-min USGS DEMs are the corrected files produced by the USGS to correct positional errors that existed in previous DEMs produced prior to 2001.