There are also definitions which equalise the terms DEM and DSM. Other definitions equalise the terms DEM and DTM, or define the DEM as a subset of the DTM, which also represents other morphological elements. In contrast to a DSM, the digital terrain model (DTM) represents the bare ground surface without any objects like plants and buildings.ĭEM is often used as a generic term for DSMs and DTMs, only representing height information without any further definition about the surface. In most cases the term digital surface model represents the earth’s surface and includes all objects on it. A digital elevation model ( DEM) is a digital model or 3D representation of a terrain’s surface - commonly for a planet (including Earth), moon, or asteroid - created from terrain elevation data.
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