Remote sensing is one of them, with all the tools this science can provide, even if this is a satellite or an aircraft. There are several methods and sources where we can obtain elevation data for the earth’s surface in order to create DEM. Methods and sources to obtain elevation data for DEM Even though, DEM is a subset of DSM it is widely used as a general term in order to describe both DSM and DTM. We deduce that DTM and DEM are subsets of DSM, while DEM is the most targeted and specific model created for scientific purposes and decision making. DTM usually provides information about soil and elevation, while DEM provides information only about the height of the ground at every point. The most general term is the DSM including elevation, terrain, and manmade features. On that point, it is useful to distinguish the differences between DEM, DSM (digital surface model) and DTM (digital terrain model).
Types of a digital elevation model file in a GIS system Differences between DEM, DSM, and DTM Environmental Analysis and Modelling Using GIS.Digital Image Processing in Remote Sensing.Water Availability, Quality, Accessibility and Monitoring.Hydrometric Analysis – Uncertainty Analysis.Hydrometric Analysis – Feasibility and design.Hydrometric Network – Monitoring and Optimization.Hydrometric Analysis – Flow Gauge Ratings.