![]() Most of the data providers ( USGS, ERSDAC, CGIAR, Spot Image) use the term DEM as a generic term for DSMs and DTMs. Other definitions equalise the terms DEM and DTM, equalise the terms DEM and DSM, ĭefine the DEM as a subset of the DTM, which also represents other morphological elements, or define a DEM as a rectangular grid and a DTM as a three-dimensional model ( TIN). ĭEM is often used as a generic term for DSMs and DTMs, only representing height information without any further definition about the surface. ![]() In contrast to a DSM, the digital terrain model (DTM) represents the bare ground surface without any objects like plants and buildings (see the figure on the right). In most cases the term digital surface model represents the earth's surface and includes all objects on it. There is no universal usage of the terms digital elevation model (DEM), digital terrain model (DTM) and digital surface model (DSM) in scientific literature. Digital Terrain Models represent the bare ground. Surfaces represented by a Digital Surface Model include buildings and other objects.
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