![]() For these models, two radar images from different sensors that are captured at the same time are used and combined. ![]() ![]() Some models are based on radar data, using InSAR Interferometric synthetic aperture radar data. Two methods are used to derive these types of elevation models. Most of them can be obtained at different resolutions. Often, these terms are interchangeable the term DEM is also widely used as a generic definition to describe DSM and DTM.Currently, various data sets are globally available such as the TanDEM-X, SRTM DEM, ASTER GDEM and the ALOS World 3D. Digital Terrain Models capture the ground and picture the bare Earth’s surface as its reference whereas, Digital Surface Models take into account natural and built surface features such as buildings and trees. Global TanDEM-X Elevation Model (Source: DLR)ĭifferent ways are currently established to model elevation: The Digital Elevation Model (DEM), the Digital Surface Model (DSM) and the Digital Terrain Model (DTM).
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