A 30 meter Digital Elevation Model (DEM) of the San Gorgonio Pass area, Riverside County, California.
Digital Elevation Models (DEMs) are digital records of
terrain elevations at regularly spaced intervals.  The
interval between elevations of 7.5 minute DEMs is
30-meters.  Each DEM file covers the area of one U.S.
Geological Survey 1 to 24,000 scale 7.5 minute
topographic quadrangle.