Paolo,
Le 05/01/2023 à 17:56, Paolo Corti a écrit :
Hi all
Do you know if I can read HDF5 files with vsicurl?
I made a few tests, but I am getting this error, so I was wondering it
it is even possible:
yes this is possible. If you get the error message you mention, it means
that the HDF5 driver is not used, but rather the netCDF one, since the
Linux userfaultfd system call is the trick used by the netCDF driver to
allow /vsicurl/ usage. Perhaps you are running from a container (like
Docker) that doesn't enable that system call by default. With Docker,
you might need to start your container with --privileged=true
If you have the HDF5 driver available, it is better integrated with the
VSI virtual file systems and that shoud work on any operating systems,
whereas /vsicurl/ with the netCDF driver can only work with Linux
Demo:
$ gdalinfo
/vsicurl/http://download.osgeo.org/gdal/data/hdf5/vlstr_metadata.h5
Driver: HDF5Image/HDF5 Dataset
Files: /vsicurl/http://download.osgeo.org/gdal/data/hdf5/vlstr_metadata.h5
Size is 3024, 1673
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 1673.0)
Upper Right ( 3024.0, 0.0)
Lower Right ( 3024.0, 1673.0)
Center ( 1512.0, 836.5)
Band 1 Block=3024x1 Type=Byte, ColorInterp=Undefined
Metadata:
TEST_BANDNAMES=SAA
TEST_CODING=0.6666666667 0.0000000000 TRUE
TEST_FLAGS=255=noValue
TEST_MAPPING=Geographic Lat/Lon 0.5000000000 0.5000000000
27.3154761905 -5.0833333333 0.0029761905 0.0029761905 WGS84 Degrees
TEST_NOVALUE=255
TEST_RANGE=0 255 0 255
Even
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