Mats, > 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."
Ouch, you hit a bug in libtiff. What you are trying to create is an absolutely large BigTIFF file. Given 128x128 tiles and your raster dimensions, the size of each of the TileByteCount/TileOffset TIFF array would be (3812500 / 128.) * (8203125 / 128.) * sizeof(double) = 15.2 GB ! For tag data, libtiff has a limitation to 2 GB (this is a - reasonable - implementation limitation, the format itself could allow to 2^63). Ideally, it should have rejected from the start this attempt instead of crashing. You may want to file a ticket about that. You can add --config GDAL_TIFF_OVR_BLOCKSIZE 1024 (or a larger value) to increase the size of overview tiles, and thus reduce the size of each array to a more reasonable ~ 230 MB. Even -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
