Digital elevation models are just as they sound: digitally created maps that show the elevation of a given geographic area through the use of three dimensional modeling techniques. This has a great number of uses from mining to search and rescue to even planetary exploration. The map shown here is a digital elevation model of the Sahara Desert in Southern Tunisia. The sand dunes and surrounding ground are shown to have intricate relief features with isolines that would not be as detailed on a two dimensional topographic map.
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