[gdal-dev] vrt: prevent opening all source files on open?
schut at satelligence.com
Mon Aug 28 03:20:12 PDT 2017
Is there a way (or: what are the prerequisites) to avoid gdal opening
all source files from a vrt on opening the vrt?
Context: I have created a large vrt, referencing many tif files. Both
the vrt and tifs are remote (using /vsigs/). It works, but opening (e.g.
running gdalinfo) is very slow.
I have a comparable vrt where the main difference is that it references
.hgt files instead of tifs. Running gdalinfo on this vrt is almost
As there are no other significant differences otherwise, I wonder if
this is because if the vrt machinery encounters a tif, it starts to
check if there are any accompanying overviews (or other important
metadata), while it does not do that for a .hgt file? Or is there a
different reason? And how can I prevent this (without, preferably,
changing to a different source file format)?
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