Hi, Do I estimate right that you have about 125 terabytes image data as uncompressed , and the first level overview would make about 32 terabytes? As JPEG compressed it would still make about 3 terabyte .ovr file. That is not too much for BigTIFF that has a size limit at 18000 petabytes, but it may still be unpractical.
I would rather split the source data into a bit smaller VRT mosaics with size around 100x100 km and start creating overviews for those. Or create a few first levels of overviews for the source tiffs and then materialize 100x100 km areas into geotiffs havin pixel size of 16 meters with gdal_translate. Or something else, but 3 TB overview file would not be my first goal. Of course it can be the best alternative for your exact use case. -Jukka Rahkonen- mapmonster wrote > Hi, > > I'm trying to build overviews on a large vrt file, but I'm getting the > following error message > "gdaladdo: tif_dirwrite.c:2449: TIFFWriteDirectoryTagData: Assertion > `datalength<0x80000000UL' failed." > > Size is 3812500, 8203125 -- Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
