Digital Elevation Models (DEM) are used to create three-dimensional or colorized pictures to show relief. This cartographic information is gathered from the United States Geologic Survey and produced into digital format in a cell or pixel. All DEM's converted to a coordinate system, a datum, and a map projection. The image above is a Digital Elevation Model of the main eight islands of Hawaii using cartographic information derived from USGS 7.5' Quads with cell size for the DEM's at 10 meters. The variations in elevation for the eight islands of Hawaii are depicting so clearly in this image because of the use of the DEM.
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