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how_to_create_dem
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Table of Contents
data acquisition
- limited number of points
- on-ground surveys
- total station or GPS
- indirect methods
- photogrammetry
- digitalization of contour lines or spot heights
- massive points
- on-ground surveys
- laser scanners
- passive and active aerial and satellite sensors
- LIDAR or RADAR altimeter
- indirect methods
- cross-correlation photogrammetric methods
- Structure from Motion
- RADAR interferometry
- digital cartography
total station or GPS
- Assuming a correct use of the instruments and the post‐processing computer tools, the MDEs generated with these data will have high accuracy
cross-correlation photogrammetric method
- comparison of digital images from stereoscopic pairs of digitized aerial photographs
- There is a wide variety in DEM accuracy depending on the flight's height and focal length of the camera, the accuracy in field support, the aerotriangulation method used, the resolution when scanning photos, the operator experience, and the instruments used.
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