Elevation: “height above a given level, especially that of sea” “height above the.Level, especially that of the sea” “distance upwards” etc. Height: “measurement from base to top” “elevation above the ground or recognized.Ground: “the solid surface of the earth” “a solid base or foundation” “a surface.Li (1990) has made a comparative analysis of these differences as follows: That is, there may be slight differences between these terms. In practice, these terms (DTM, DEM, DHM, and DTEM) are often assumed toīe synonymous and indeed this is often the case. DTM = (earth) surface without any objectsĪ different definition is found in :ĭEM is a subset of DTM and the most fundamental component of DTM. DSM = (earth) surface including objects on it.I think this image on Wikipedia depicts the differences between DSMs and DTMs well: In my experience, DEM is most of the time used as a generic term for DSMs and DTMs.
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