DEM stands for Digital Elevation Model, and these types of maps consist of a raster grid of elevation values. This is a DEM of the continental United States. In this map, you can see the higher elevations and see where there are mountains, and mountain chains, or just areas of higher elevation. You can see the fading Appalachian mountains in the eastern region of the united states and then you can see the much greater land area is of higher elevation in the western region.
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