DEM or Digital Elevation Model is a map that shows a three-dimensional representation of a planet, moon, or asteroids surface. These maps use remote sensing technology to not only map a region, but to map the region into a digital model. Map makers use these models to show or create relief in a map. The map above is a DEM of the Sahara desert in Southern Tunisia. The map shows a true image of the desert along with true elevation of the area.
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