DEM- Digital Elevation Model. File is georeferenced, in a raster format, and consists of terrain elevations for ground positions at regularly spaced horizontal intervals. USGS raw DEM has 30- x 30-meter resolution (the size of each pixel). This is a DEM of the summit area of the Mauna Kea Volcano, Hawaii. A three-dimensional image has been rendered using elevation data to bring out relief (http://vterrain.org/Hawaii/Structures/observatories.html).
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