Digital elevation model | DEM | DSM | DTM | What is Digital elevation model 

#Digitalelevationmodel #DEM #USMANGEO #earthscience
A digital elevation model (DEM) is a 3D computer graphics representation of elevation data to represent terrain, commonly of a planet (e.g. Earth), moon, or asteroid. A "global DEM" refers to a discrete global grid. DEMs are used often in geographic information systems, and are the most common basis for digitally produced relief maps.
While a digital surface model (DSM) may be useful for landscape modeling, city modeling and visualization applications, a digital terrain model (DTM) is often required for flood or drainage modeling, land-use studies,[1] geological applications, and other applications,[2] and in planetary science.
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GIS Open Course Ware | Geographic Information System
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