- Suppose you want the DEM for Annapolis, MD, at N38.98, W76.48.
- It is bounded by latitudes 38 and 39, and longitudes -76 and -77.
- The SW corner is N38W077.
- You want the file N38W077.hgt.zip.
- Since Annapolis is almost at the edge of the DEM, you might want to
also get the file to the north (N39W077.hgt.zip).
- Unzip . Do not rename the files. They have no header, and the
file name must be correct for georegistration to work.
two (or more) DEMs