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).Rectification of aerial photography or satellite imagery.Creation of physical models (including raised-relief maps). ![]() In most cases, we can state that: A digital terrain model is a representation of the Earth’s surface. Different terms are used, often interchangeably. Modeling water flow or mass movement (for example, landslides). Dening what a digital terrain model (DTM) is not simple because there is no universal agree-ment, neither among practitioners nor in the scientic literature.Reference 3D products include quality masks that give information on the coastline, lake, snow, clouds, correlation etc.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).
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