If it can be useful to anyone facing the same issue, my little script for parsing these aux.xml and writing the expected GDAL commands to rectify the raster is available here https://github.com/domlysz/PAM-GCPs-warper
Regards Le mer. 20 mars 2019 à 18:09, Dominique Lyszczarz <[email protected]> a écrit : > Thank you Even for these informations, that's good to know. I've added the > .aux.xml in the repository if it can be useful as reference. Finally, I got > good results with gdal_translate -gcp option following by gdalwarp. Fun > fact, in the PAM file Y image coordinates are negatives values but must be > pushed as positive number in gdal_translate command. > > Le mer. 20 mars 2019 à 15:57, Even Rouault <[email protected]> a > écrit : > >> Dominique, >> > >> > I'm trying to read a raster georeferenced with ArcGIS. It's a jpg file >> > coming with a PAM file (.aux.xml) that store GCPs and define a >> polynomial >> > transformation of order 3. Unfortunately GDAL does not take the PAM file >> > into account and gdalinfo does not report GCPs. After some >> investigations, >> > I found this commit >> > < >> https://github.com/OSGeo/gdal/commit/f8822eb50466fb740e228b8c6a7f066b916faa >> > 0a> that suggest PAM files are supported by GDAL but only for TIFF >> dataset. >> >> Not really. PAM files are supported for most formats, included JPEG, but >> the >> ESRI specific GCP decoding was limited for now to the GTiff format, >> mostly >> because of the oddity you noticed: in the case for which this was >> developed >> for >> (see https://lists.osgeo.org/pipermail/gdal-dev/2017-January/045854.html >> and >> the related email thread), pixel coordinates were indeed surprisingly in >> inches and from the bottom left origin. So I couldn't/didn't want to >> generalize that to core PAM processing. >> >> > >> > I'm a bit confused with theses PAM files, is there any technical doc >> from >> > ESRI? >> >> Not to my knowledge. Initially PAM was developed for GDAL itself, but it >> seems >> ESRI developed some extensions on top of it, like the one you are facing >> to. >> >> > The file can be downloaded here : >> > >> https://drive.google.com/drive/folders/1hZXncJhcfZI0Uem-oCfUsruO9mPwWD0U?usp >> > =sharing >> >> You didn't include the most interesting part, that is the .aux.xml file >> itself >> >> Even >> >> -- >> Spatialys - Geospatial professional services >> http://www.spatialys.com >> >
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