The information equipped in Digital Elevation Model is by using remote sensing techniques like photogrammetry (a type of collecting images of physical objects), LIDAR (With the help of laser technique), IfSAR (a type of RADAR technique) and land surveying (With the help of field workers). The models that are generated with the help of the Digital Elevation Model technique are mainly 2 dimensional and 3-dimensional array of data. This can be of a Mountain, Plateau or even a Planet. Digital Elevation Model (DEM)ĭigital Elevation Model is the computer graphic representation of any terrain surface. The imagery generated through this method can be either in RGB format or in traditional black & white format. Various types of land use and hydrography features can be classified during image processing. The image value in the pixel represents the light or energy that is emitted and reflected from the earth back to the satellite sensors, which collects the data. The imagery is remotely sensed and collected data in the raster format. Let us study the above-mentioned types in details: 1. Raster Data is further classified into various types they are: SONAR and RADAR are perfect examples of this type of sensor. Active Sensors emits their signal, and the sensors in the satellite measures what is reflected.
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