A digital elevation model (DEM) is a digital representation of ground surface topography or terrain. A DEM can be represented as a raster (a grid of squares) or as a triangular irregular network. DEMs are commonly built using remote sensing techniques, however, they may also be built from land surveying. DEMs are used often in geographic information systems, and are the most common basis for digitally-produced relief maps.This image is a Digital elevation Model of the Hartnett Study Site. It displays the topography of the Hartnett study site in three dimensions. The model was created by digitizing a georeferenced DRG (Digital Raster Graphic) in Arcview GIS.
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