Definition: Digital Elevation Model (DEM)

UN - Geographic Information Systems

A digital representation of elevation information for a part of the Earth’s surface. A DEM is usually a raster data set in which elevation values are stored for cells in a fine grid, but vector formats can also be used to store elevation. A DEM is s also called a digital terrain model (DTM).
Source:
United Nations, "Handbook on Geospatial Infrastructure in Support of Census Activities", Department of Economic and Social Affairs, Statistics Division, Studies in Methods, Series F No. 103, New York, 2009
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