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topography of the Earth in digital format, that is, by coordinates and numerical descriptions of altitude. DEMs are used often in geographic information systems.
A free DEM of the whole world called GTOPO30 (30 arcsecond resolution, approx. 1km) is available (see Link below). It can be used to generate maps such as in the . Several other DEMs are available, but the better they are, the more they cost.
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