A DEM map is short for a "Digital Elevation Model". This is usually depicted by a map which uses 3-Dimensional figures to represent the images. These types of maps are commonly used when describing craters on the surface of the moon or canyons and mountains when depicting a scene here on Earth. Most of the time this model only references height and depth without describing any of the other features that could be used to describe that particular type of terrain. This Map exemplifies a DEM map because it illustrates the map the same way we just described it. It shows us the elevations without giving us too much descriptive types of detail.
http://www.waialeale.org/graphics/kauaioverview.jpg
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