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In most of these instances the models of buildings, urban features, terrain surface, and vegetation are the primary features of interest. LiDAR data (Light Detection And Ranging) is a mature technology for obtaining the Digital Surface Models (DSMs) of the earths surface. It is really a quick technique for sampling the earths surface with a high density and high positional accuracy. This data when combined with satellite imagery may be employed to produce extremely detailed Digital Surface Models (DSMs) and eventually Digital Elevation Models (DEMs) to create a 3D virtual world.
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