Digital surface models (DSM) are digital, numerical models of the earth's surface height. Unlike the Digital Terrain Models (DTM) describes in built or vegetated areas not the level of the natural ground (terrain), but the height of the surface of the earth-based natural and artificial objects, such as vegetation, buildings or pipes.
Digital terrain models are regularly used as a basis for planning in many areas. Among the most common include hydrographic projects as well as infrastructure projects in roads, railways or pipelines.
Currently it can be found even comprehensive aerial surveys of entire states instead for the procurement of basic data.
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