William,
it might be perhaps related to the GetMinimum() call done by gdalinfo.
Cf https://trac.osgeo.org/gdal/ticket/5444
But normally it should only try to open the first source, and not all of
them. At least that's what I could confirm on a quick testing. But I do
see that the CanUseSourcesMinMaxImplementations() method will stat()
sources whose filename looks like a local file (obviously if that's a
mounted file system / vpn thing, it will not realize it is remote).
Try setting the VRT_MIN_MAX_FROM_SOURCES=NO environment variable /
configuration option to see if that makes a difference. If it does, the
CanUseSourcesMinMaxImplementations() logic should be modified to avoid
doing those stat's().
If that's confirmed to be linked to GetMinmum(), you may also workaround
the issue by doing a "gdalinfo -stats the.vrt" (from the server) to have
statistics incorporated in the VRT, then GetMinimum() should be instant
Even
Le 09/06/2023 à 00:43, William Kyngesburye a écrit :
I'm writing a script that needs some info from a vrt raster, and one has
thousands of files. When reading the vrt over the internet (vpn to our server)
it takes a long time. I think it's looking at every file of the vrt. What is
gdal reading from the files that's not in the vrt itself? I used all the -no
options and I'm not adding any other info options like checksums or stats. I
just need basic info from the vrt that's in the vrt file.
-----
William Kyngesburye
<kyngchaos*at*kyngchaos*dot*com>
<https://www.kyngchaos.com>
Don't Panic
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