[gdal-dev] "gdaladdo: tif_dirwrite.c:2449: TIFFWriteDirectoryTagData: Assertion `datalength<0x80000000UL' failed."

[jratike80]

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





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