Digital elevation model (DEM)

Generic term covering digital topographic data in all its various forms as well as the method for interpreting implicitly of the elevations between observations (Maune et al., 2001).- Digital terrain model (DTM): DTM is a synonym of bare-earth DEM (Maune et al., 2001). Florinsky 1998, defined DTMs as digital representations of variables relating to a topographic surface, namely: digital elevation models (DEMs), digital models of gradient (G), aspect (A), horizontal (Kh) and vertical (Kv) land surface curvatures as well as other topographic attributes. Digital surface model (DSM): Model depicting elevations of the top of reflective surfaces, such as buildings and vegetation (Maune et al., 2001).