A digital terrain model is a topographic model of the bare earth –terrain relief - that can be manipulated by computer programs. The data files contain the spatial elevation data of the terrain in a digital format which usually presented as a rectangular grid. Vegetation, buildings and other man-made (artificial) features are removed digitally - leaving just the underlying terrain.
The main applications are:
1. Visualization of the terrain.
2. Reduction (terrain correction) of gravity measurements (gravimetry, physical geodesy).
3. Terrain analyses in Cartography and Morphology.
4. Rectification of airborne or satellite photos.
5. Extraction of terrain parameters, model water flow or mass movement.
The real elevation of the land excluding the buildings and other objects. For example, show only object higher then a given value selected by the user.
Easy to identify high and low elevation point on the land.