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Benjamin showed us the results of a DAI program to collect and georeference these images for the entire north of Africa. He pointed out, that the original 70mm-films show transects of 200-300 km length. This means that apart from the perspective adjustment the georefencing has to adjust for the curvature of the earth. A tool that does that has now been developed for GRASS GIS and is available on Github (https://github.com/OSGeo/grass/tree/releasebranch_7_8). It will be part of the next release of GRASS GIS as part of the i.ortho-modules.
Finding islands in a DEM
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