Making DEMs and Orthoimages

The overlap area in a stereo pair of airphotos or satellite images contains 3D information you can use to create an elevation raster (DEM). Then put an input DEM together with an airphoto or satellite image to create an orthoimage: an image that has been processed to remove systematic distortions of distance, perspective, and other factors so that the result has map-like geometry. (Sample data exceeds TNTlite limits.)

georeference control points

parallax tie points

automatic tie points

view stereo 3D

automatic restitution

orientation tie points

improving map accuracy

TIN / DEM extraction

DEM evaluation

orthoimage evaluation

Making DEMs and Orthoimages (file date: 4 Jan 10)

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page update: 13 Aug 10