and the methods used to create them. One example is the use of three dimensional technology to create a vitual landscape. In the past elevation had to be represented on a two dimensional plane by representing elevations with lines, or contours. Now with the use of GPS and GIS, Digital Elevation Models (DEM) can be created to represent the world in three dimensions. Google Earth, Windows Live, and World Wind all use three dimensional mapping to create maps that are fun to look at and play around with.
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