A DEM is a model that is used to represent the height of earth surface for the given area. Most DEMs are completed by the U.S. Geological Survey (USGS). DEM uses a fixed grid interval that is always referenced to some geographical coordinate system. The DEM is a generic form of the DSM and DTM. The picture above shows a DEM for the state of California. It is interesting to note the changes in elevations throughout the state of California due to its vast size.
http://mapsof.net/map/digital-elevation-map-california
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