http://images.google.com/imgres?imgurl=http://www.satimagingcorp.com/media/images/dem-5.jpg&imgrefurl=http://www.satimagingcorp.com/svc/dem.html&h=295&w=400&sz=132&hl=en&start=2&tbnid=FB5HV-GF9ptFVM:&tbnh=91&tbnw=124&prev=/images%3Fq%3DDEM%26gbv%3D2%26hl%3DenThe above image is a DEM (Digital Elevation Model) of Africa from 2005. A digital elevation model is a digital image of ground surface topography or terrain. It is also known as DTM or Digital Terrain Model.
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