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Airborne lidar sensors are used by companies in the remote sensing field. They can be used to create a DTM (Digital Terrain Model) or DEM (Digital Elevation Model); this is quite a common practice for larger areas as a plane can acquire 3–4 km (2– 2 + 1 ⁄ 2 mi) wide swaths in a single flyover. Greater vertical accuracy of below 50 mm (2 ...