GeoTIFF does not store any WKT inside. GDAL is converting the definition of the CRS into the proper GeoTIFF tags. With "tiffinfo" you can see them, for instance:
TIFF Directory at offset 0x8 (8) Image Width: 306 Image Length: 175 Bits/Sample: 32 Sample Format: IEEE floating point Compression Scheme: None Photometric Interpretation: min-is-black Samples/Pixel: 1 Rows/Strip: 6 Planar Configuration: single image plane Tag 33550: 0.025000,0.016667,0.000000 Tag 33922: 0.000000,0.000000,0.000000,11.687500,51.208333,0.000000 Tag 34735: 1,1,0,7,1024,0,1,2,1025,0,1,1,2048,0,1,4258,2049,34737,7,0,2054,0,1,9102,2057,34736,1,1,2059,34736,1,0 Tag 34736: 298.257222,6378137.000000 Tag 34737: ETRS89| Any other software has to "interpret" those tiff tags. Usually using libgeotiff (that uses PROJ), but they can do anything else. On Fri, 20 Dec 2024 at 14:46, Kirk Waters - NOAA Federal via gdal-dev < gdal-dev@lists.osgeo.org> wrote: > Is there a way to tell GDAL to list the full set of projection parameters > in a GeoTiff? As much as I like the idea that you should just need the EPSG > code, I've run across too many software packages that either don't know the > code or have an incorrect interpretation of the code. I've tried supplying > the WKT (from projinfo) as the -a_srs argument, but that still only puts > the EPSG code in the georeferencing keys. > > I did find that if I strip the authority code from the WKT, it will put > all the parameters in and perhaps that's the best solution. It seems a > shame to lose the authority code though. > > Here's a few bash commands to illustrate. > > wkt=`projinfo -o WKT2:2019 EPSG:6570 --single-line | sed 1d` > > gdal_create -of GTiff -ot UInt16 -burn 0 -outsize 50 50 -a_srs "$wkt" > wkt.tif > > gdal_create -of GTiff -ot UInt16 -burn 0 -outsize 50 50 -a_srs EPSG:6570 > epsg.tif > > #strip the authority code > wkt_noauth=`echo $wkt | perl -p -e 's/],ID\["EPSG",6570]/]/;'` > > gdal_create -of GTiff -ot UInt16 -burn 0 -outsize 50 50 -a_srs > "$wkt_noauth" wkt_noauth.tif > > Thanks for any suggestions. > > Kirk Waters, PhD > NOAA Office for Coastal Management > Applied Sciences Program > coast.noaa.gov/digitalcoast > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev >
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