Hello,
I've come up against a problem with `gdalbuildvrt` taking a long time to
create
a VRT when it is passed a large number of source datasets. I am trying
to create
a VRT file for a zoom level in a TMS structure containing JPEG tiles. The
command I'm using is:
gdalbuildvrt output.vrt `find ./tiles/18 -iname *.jpg -printf "%p "`
where the number of tiles is:
$ find ./tiles/18 -iname *.jpg | wc -l
767104
The processing seemed to progress reasonably quickly with the progress bar
outputing '0... etc ...100 - done'. However `gdalbuildvrt` continued
running
until I killed it 8 hours later. Looking at `output.vrt` just before I
killed
the program showed it remained empty (0 bytes).
Before digging any deeper is there something I'm missing? Am I expecting too
much of `gdalbuildvrt`, or indeed the VRT format, in processing this
many source
datasets?
Conceptually in this instance it seems as if it would be useful for a
VRT file
(and `gdalbuildvrt`) to reference the output of `gdaltindex` or something
similar. I'm not sure how efficiently source datasets are indexed in
VRTs and
whether this might be contributing to the problem?
Best regards,
Homme Zwaagstra
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