What are digital elevation models in a GIS software? Why we used it in a GIS software? Explain it benefits for the civil engieering and how we used it for survey of sites?
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What are digital elevation models in a GIS software? Why we used it in a GIS software? Explain it benefits for the civil engieering and how we used it for survey of sites?
Fasi Ur Rahman
The digital elevation model in GIS software is the digital representation of surface elevation of a particular land with reference to the fixed datum or level.
DEM represents the topographic surface which is used for extracting terrain parameters for geomorphology, modeling water flow for hydrology, or mass movement, and other levels related works.
aviratdhodare
Digital elevation models are digital representations of x, y, and z locations of points on the surface area of a terrain. These locations are acquired either from a GPS receiver, survey instruments, or aerial or satellite stereo photography depending on the spatial accuracy needed.
These digital files of x, y, and z locations are used by the algorithms in a GIS software to transform into either three-dimensional surfaces or elevation contours. It is the GIS software that makes use of this “spatial data.” The output of these algorithms are used for further analyses and calculations.
These could be; calculating cut and fill off of the land under study, 3D visualization of a terrain, watershed and viewshed analyses, and many other civil engineering, infrastructure, architectural and even video games, defense and intelligence-related applications and uses.
Hope this helps.