(2 2 3) (2010-2011 Bahar Dönemi) Ders Sorumlusu - Jeoloji Bilgi ...

JEO 498 11.03.2008
6.2. ĐLGĐLĐ TANIMLAMALAR
DEM: The word elevation emphasizes the measurement of height above a datum and
the absolute altitude or elevation of the points in the model. DEM as a term is in
widespread use in the US, generally refers to the creation of a regular array of
elevations, normally squares or a hexagon pattern over the terrain.
DHM: This is a less commonly used term with the same meaning as the DEM since
the word elevation and height are normally regarded as synonymous. The term seems
to have generated in Germany.
DGM: This term seems to lay its emphasis on a digital model of the solid surface of
the Earth. The term seems to have generated in UK.
DTM: A more complex concept involving not only height and elevations but also
other GIS features such as rivers and ridge lines. Moreover, DTM may also include
derived data about the terrain such as slope, aspect, and visibility. In a narrow sense, a
DTM represents terrain relief. In its general form, a DTM is considered by most people
to include both planimetric and terrain relief data.
M.E.