[gdal-dev] gdalbuildvrt, gdal_translate, and MODIS HDF files
even.rouault at mines-paris.org
Tue May 3 13:21:25 EDT 2011
Le mardi 03 mai 2011 15:34:16, Jose Gomez-Dans a écrit :
> > > > I have recently come across the mosaicking magic that is 1) build a
> > > > usin gdalbuildvrt and then 2) gdal_translate the vrt to whatever
> > > > I want -- I'm noticing this is a crazy-fast way to do mosaicking
> > > > compared
> I had a similar question on this a while ago, and one thing you have to be
> wary about is that the HDF libraries usually have a finite number of HDF
> files open simultaneously (see <http://trac.osgeo.org/gdal/wiki/HDF>). If
> you plan on using more than (say) 32 files simultaneously, you'll need to
> recompile the HDF library.
There should be no problem assembling more than 32 files in a VRT while keeping
the number of files opened simultaneously below a certain threshold.
By default, it is set to 100. But you can change it by setting the
GDAL_MAX_DATASET_POOL_SIZE configuration option/environment variable to another
value, e.g. 30 in your case.
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