Above is a DEM for Red Rocks Amphitheater in Morrison, CO. The model is done in Raster format, meaning the related cartographic information is recorded, stored and processed in a pixel. The information generated from this process (relief) here is represented by the change in color on the map. The standard USGS raw DEM has a resolution of 30 x 30.
http://en.wikipedia.org/wiki/Digital_elevation_model
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