Hi, The http://... downloads the file, use the vsicurl method instead. Test with gdalinfo:
gdalinfo /vsicurl/"https://noaa-ocs-nationalbathymetry-pds.s3.amazonaws.com/BlueTopo/BC26826R/BlueTopo_BC26826R_20241023.tiff"; -Jukka Rahkonen- ________________________________________ Lähettäjä: gdal-dev <[email protected]> käyttäjän Kirk Waters - NOAA Federal via gdal-dev <[email protected]> puolesta Lähetetty: Tiistai 16. joulukuuta 2025 22.32 Vastaanottaja: [email protected] <[email protected]> Aihe: [gdal-dev] Raster attributes tables with URL raster Dear GDAL gurus,I'm struggling a little with raster attribute tables if the file is remote. They don't seem to be recognized. For example, there is a file (https://noaa-ocs-nationalbathymetry-pds.s3.amazonaws.com/BlueTopo/BC26826R/BlueTopo_BC26826R_20241023.tiff) with a side-car *.aux.xml file that has a RAT for band 3. If I pull down those two files locally and run gdalinfo on it, I can see the RAT. If I do the same with the URL, no attributes show. My goal is to grab the RAT in python, but this test script also gets nothing for each band (each band has a NoneType RAT instead of a gdal.RasterAttributeTable).from osgeo import gdalgdal.UseExceptions()url='https://noaa-ocs-nationalbathymetry-pds.s3.amazonaws.com/BlueTopo/BC26826R/BlueTopo_BC26826R_20241023.tiff'ds = gdal.Open(url)for band_id in range(ds.RasterCount): band = ds.GetRasterBand(band_id+1) rat = band.GetDefaultRAT() print(f"Band {band_id+1} has rat type {type(rat)}")Is there something I'm doing wrong? I've tried the various options for GDAL_DISABLE_READDIR_ON_OPEN, but they haven't changed the result.Thanks,Kirk Waters, PhD NOAA Office for Coastal ManagementApplied Sciences Program coast.noaa.gov/digitalcoast _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
