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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
Explain dtm and dem .how these are used in civil engineering problem?
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Sajan sarthak
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DEM A digital elevation model is a bare-earth raster grid referenced to a vertical datum. When you filter out non-ground points such as bridges and roads, you get a smooth digital elevation model. The built (power lines, buildings and towers) and natural (trees and other types of vegetation) aren’t included in a DEM. DTM DTMs are typically created through stereo photogrammetry like in the example above. For example, contour lines are in purple. The DTM points are regularly-spaced and characterize the shape of the bare-earth terrain. first figure is DEM &2ND IS DTM
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Rahul kumar![best-answer]()
Digital Terrain Model (DTM) is a part of DEM (Digital Elevation Model) in which terrains have been further enhanced with various parameters. DEM is generated from from variably spaced Lidar groud points and they can also be created using raster grids. Application in civil engineering: DEMs are very important sources of spatial information. Surface topography is the main factor in estimating catchment areas and surface water runoff. Nowadays DEM is used extensively for watershed modelling and monitoring. DEMs also play an important role in assessment of risks associated with natural hazards.