Hi, So now we have the right question: how to remove overviews from cloud optimized GeoTIFF.
First confirm your findings: gdal_create -of cog -outsize 1000 1000 cog.tif 0...10...20...30...40...50...60...70...80...90...100 - done. test1: gdaladdo cog.tif ERROR 6: cog.tif: Cannot add external overviews when there are already internal overviews Overview building failed. test2 gdaladdo -clean cog.tif ERROR 6: cog.tif: Cannot add external overviews when there are already internal overviews Cleaning overviews failed. All right, COG is a GeoTIFF and only metadata tells that it is also COG Image Structure Metadata: LAYOUT=COG COMPRESSION=LZW INTERLEAVE=BAND So, let's try to remove the metadata. No success but an interesting message: gdal_edit -unsetmd cog.tif File cog.tif has C(loud) O(ptimized) G(eoTIFF) layout. Updating it will generally result in losing part of the optimizations (but will still produce a valid GeoTIFF file). If this is acceptable, open the file with the IGNORE_COG_LAYOUT_BREAK open option set to YES. Let's try the suggested option: gdaladdo -clean cog.tif -oo IGNORE_COG_LAYOUT_BREAK=yes Success! Now it is your turn to suggest improvements to COG driver manual page and to the error messages of gdaladdo. -Jukka Rahkonen- ________________________________________ Lähettäjä: Javier Jimenez Shaw Lähetetty: Maanantai 12. toukokuuta 2025 16.48 Vastaanottaja: Rahkonen Jukka Kopio: gdal dev Aihe: Re: [gdal-dev] I cannot clean overviews from GeoTIFF Apparently it is related with COG:$ gdal_translate -of COG foo.tif foo.cog.tifInput file size is 1000, 10000...10...20...30...40...50...60...70...80...90...100 - done.$ gdaladdo -clean --debug ON foo.cog.tif GDAL: GDALOpen(foo.cog.tif, this=0x15900ae00) succeeds as GTiff.GTiff: ScanDirectories()GTiff: Opened 500x500 overview.GTiff: File open for read-only accessing, creating overviews externally.ERROR 6: foo.cog.tif: Cannot add external overviews when there are already internal overviewsCleaning overviews failed.GDAL: GDALClose(foo.cog.tif, this=0x15900ae00) _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
