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I am looking to use the Gram-Schmidt pan-sharpening method in Python but I can't find any libraries that have this as an option. I found this, but I don't understand where to even go after reading it https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-1-W1/239/2013/isprsarchives-XL-1-W1-239-2013.pdf

I know you can do this in ArcGIS but I am trying to do everything open source.

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    I see in your cited report that the method has been patented by KODAK ~ patents.google.com/patent/US6011875A/en The method is available in commercial software ESRI/ENVi, but I couldn't find any reference in open source software or libraries (GRASS/QGIS/SAGA/GDAL/orfeo/mapbox) so wondering whether that's because some fee is required...
    – nmtoken
    Apr 24, 2020 at 15:09
  • ohhh maybe so, that would make sense.
    – Emtomp
    Apr 24, 2020 at 15:12
  • I just wanted to point out that the patent expired in 2018, so that would not be a problem anymore. Dec 2, 2022 at 9:18
  • An issue is opened in GDAL, for anyone who wants to contribute: github.com/OSGeo/gdal/issues/5286
    – remi.braun
    Jan 4, 2023 at 13:19

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Not sure if you ever got an answer for this, but I found the R package fusionImage to be a useful tool for pansharpening. Not Python per se, but open-source nonetheless. I believe it was released shortly after your question was first posted.

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