[gdal-dev] gdal_translate a VRT built on top of GeoTIFFs with NaN

[Daniele Romagnoli]

Hi List,

I have a reprojectiion tool which creates GeoTIFFs with NoData = NaN.
I'm creating couple of GeoTIFFs with partially overlapping areas where
GeoTIFF1 has NaNs in a region and GeoTIFF2 has proper values in the same
overlapping region and viceversa (GeoTIFF2 has some NaN area while GeoTIFF1
has valid pixels for same area).
I have built a VRT on top of them and then translated into a single GeoTIFF.
However, the result has NaN in those regions.
I was hoping that the area containing NaNs would have been ignored instead,
in favor of proper values from the other file.
Is there any flag, properties or suggestions to make it working?

If I configure the reprojection tool to write NoData = -9999 and then use
gdalbuildvrt -srcnodata -9999, things are working fine.
So I'm just wondering if the same can be achieved dealing with NaN instead
of custom values.

Please, let me know.
Cheers,
Daniele

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