Thank you Even, especially for highlighting a DEM should be used. I 'knew' that but hadn't taken the time to fully ingest the meaning. It's drastically changed how I'm approaching this project.
-Matt From: Even Rouault <[email protected]> Sent: November 10, 2021 2:16 PM To: Matt.Wilkie <[email protected]>; [email protected] Subject: Re: [gdal-dev] georeferenced but not georeferenced? Le 10/11/2021 à 22:03, [email protected]<mailto:[email protected]> a écrit : Hi all, I'm creating images from SPOT6/7 archive DIMAP format. The resulting images display in the correct position in the world when combined with other sources, however all the usual tools say the images have no georeferencing. * If the images have no georeferencing how do ArcMap/Pro and Qgis know to put them in the right place? Those images have RPC. You can see RPC information with gdalinfo in the "RPC Metadata" section listeo/geotiffcp and a number of utilities are not RPC aware. But gdalwarp is. * How can I convert whatever-this-is into proper georeferencing so that other tools know how to handle them too? You can use gdalwarp to orthorectify them. You should generally specify -to RPC_DEM=some_dem_with_elevation_as_ellipsoidal_heights or -to RPC_HEIGHT=ellipsoidal_height. See https://gdal.org/api/gdal_alg.html?highlight=rpc_dem Attached is a sample image. It was created with (on one line): gdal_translate -outsize 100 0 -co compress=zstd -co predictor=yes -co level=17 -co bigtiff=yes -of cog .\path\to\IMG_SPOT6_MS_001_A\DIM_SPOT6_MS_201609082010410_SEN_1.XML source_tiny.tif The biggest problem this causes me at the moment is that gdal_pansharpen.py output does not have any kind of goereferencing, and I can't use old faithfuls like listgeo, geotiffcp, or gdalcopyproj.py to copy the coordinate system across. thanks in advance for your thoughts, Matt Wilkie Geomatics Developer & Administrator Environment | Technology, Innovation and Mapping T 867-667-8133 | Yukon.ca Hours: 08:30-16:30, Mon-Wed: Office, Thu: Remote, Fri: Away. _______________________________________________ gdal-dev mailing list [email protected]<mailto:[email protected]> https://lists.osgeo.org/mailman/listinfo/gdal-dev -- http://www.spatialys.com<https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.spatialys.com&umid=9E426F74-D075-BC05-8F12-F338C4BD772D&auth=c132af8ee7c9d1278d61a701569070a095ce962e-893f1a6a29bf04fdcbd6545284ebfde530cc8c97> My software is free, but my time generally not.
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