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what is the difference between UAS processing and traditional photogrametry processing? Are the modules the same?

Question asked by Thomas Koch on May 29, 2017

Smaller UAV images in general (fixed-wing and multicopters) are quite different from classic aerial cameras in big planes. Orientation angles are larger and their changes are more extreme (the flight is a lot less stable). Furthermore, UAV imagery often shows more motion blur etc. and of course the ground resolution is much higher (think about grass in the wind). All this needs different strategies and matching techniques to be applied to successfully match tie points. 
Another point is that UAV images typically are small enough to be read completely into the computers' memory - for larger aerial images, the TIFFs are too large for that, so also here I/O of images is optimized for one or the other case in UASMaster or in MATCH-AT. The differences are mainly in the georeferencing part and of course the UAS software does not have all the parameters (workflows are more streamlined).
E.g. for tie point matching we also use SIFT which for classic photogrammetry would be by far too slow. Also weighting of observations and iterations are different. But the core is exactly the same.