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GISuser Guide to downloading Free 1:250K USGS DEMs
Written by GISuser
Thursday, 26 February 2004 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. 1-Degree DEMs correspond to the 3 arc-second - 3- x 3-arc-second data spacing - (or 1:250,000-scale) USGS topographic map series, and are available for all of the contiguous U.S. and most of Alaska.
They are expressed in geographic coordinates (latitude/longitude). Most are referenced to the World Geodetic Survey (WGS) system of 1972 (WGS72), but some are referenced to the WGS system of 1984 (WGS84). Grid spacing is 3 arc-seconds.
To download FREE 1:250K USGS DEM data, please select a State on the map below.
Note: The image used to create this map was provided by the USGS
See more threads and details about Glenn's AnyGeo Weblog HERE The Editor (Glenn) started the AnyGeo blog some time ago and the threads are now also mirrored here at GISuser.com - RSS feed is available to add to your favorite news reader.
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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. 1-Degree DEMs correspond to the 3 arc-second - 3- x 3-arc-second data spacing - (or 1:250,000-scale) USGS topographic map series, and are available for all of the contiguous U.S. and most of Alaska.
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