Web Reference: What is a digital elevation model (DEM)? A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects. A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid. Digital Elevation Models, or DEMs, are three-dimensional models of the “bare earth” surface, showing elevation and topography without trees, buildings, or other objects.
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