Digital Surface Model ( DSM)ĭigital Surface Model ( DSM) represents the MSL elevations of the reflective surfaces of trees, buildings, and other features elevated above the “Bare Earth”. Now let’s a have a look what is Digital Surface Model (DSM). Terrain analyses in geomorphology and physical geography.Reduction (terrain correction) of gravity measurements (gravimetry, physical geodesy).The administration of Berlin City has recently successfully used this methodology in co-operation with Hansa. However there is also another process whereby stereo aerial imagery can be used to generate such models.
Rectification of aerial photography or satellite imagery. Digital surface and terrain models are normally generated from airborne laser scanning surveys.Creation of physical models (including raised-relief maps).Modeling water flow or mass movement (for example, landslides).DSM’s absolute accuracy of 3 meters in all dimensions is achieved without ground control points and is consistent on all surfaces and terrain types. Reference 3D products include quality masks that give information on the coastline, lake, snow, clouds, correlation etc. An accurate global digital surface model high-resolution elevation data representing every single point on Earth.sampling density (elevation data collection method).Several factors play an important role for quality of DEM-derived products: The quality of a DEM/DTM is a measure of how accurate elevation is at each pixel (absolute accuracy) and how accurately is the morphology presented (relative accuracy). For practical purpose this “Bare Earth” DEM is generally synonymous with a Digital Terrain Model (DTM). A DSM (Digital Surface Model) captures both the natural and built/artificial features of the environment, as shown below A DTM (Digital Terrain Model) typically augments a DEM, by including vector features of the natural terrain, such as rivers and ridges.
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