HARP Digital Elevation Model Files
Download the Digital Elevation Model (DEM) quads file in KMZ format, then open it in Google Earth or other geographic browsers to find out what DEM files you need to download for your project. If a facility happens to fall on or close to a boundary of the quads, you may also want the DEM files of its surrounding quads, since the plume may go that way(s).
Most of the DEM files are in 30x30m resolution. Some locations have two DEM files with one in 10x10m resolution and the other in 30x30m resolution. Quads with an asterisk at the beginning of its name have DEM files in 10x10m resolution only.