A digital elevation model is a digital model or 3D representation of a terrain`s surface — commonly for a planet (including Earth), moon, or asteroid — created from terrain elevation data. == DEM, DSM or DTM == There is no common usage of the terms digital elevation model (DEM), digital terrain model (DTM) and digital surface model (DSM) in s....
Found on
http://en.wikipedia.org/wiki/Digital_elevation_model
A 3D representation of the height and shape topography of the Earth's surface. A DEM is formed by a regular grid of height values and can be overlayed with other data to create DTM.
Found on
http://www.encyclo.co.uk/local/20195
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