Digital Elevation Models
(DEMs)
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Locate
DEMs of USGS topographic quadrangles for Nevada on a clickable
map or identify by quad name, then download zipped
DEM images, header files, and metadata. Select either 1:100,000 or 1:24,000
scale quads. California DEMs are
available from Humboldt State University. DEM files can be imported directly
into ArcView configured with the Spatial Analyst extension. Please note that
this database is not complete. DEMs not available on Keck may be downloaded
from geo-community (free) or purchased
from the USGS.
About DEMs
A digital elevation model (DEM) is a digital file consisting of terrain elevations
for ground positions at regularly spaced horizontal intervals. The USGS produces
five different digital elevation products. Although all are identical in the manner
the data are structured, each varies in sampling interval, geographic reference
system, areas of coverage, and accuracy; with the primary differing characteristic
being the spacing, or sampling interval, of the data. The USGS provides a free 3-D
viewer you may download.
For more information on DRGs go to the
USGS DEM home page.
