Hi, The ubuntugis-unstable builds of gdal have a problem with netcdf-4 files (which use hdf5 storage).
The consequence is that netcdf-4 files are not supported in apps that use gdal (like qgis), because the hdf5 driver does not read dimension information of netcdf-4 files. Long story short - proper detection of netcdf-4 support in gdal netcdf driver requires nc-config which is in netcdf-bin package - although it should be in libnetcdf-dev (these are built by ubuntu). Could the packagers add netcdf-bin as a dependency for gdal builds? Long story: netcdf-4 files use hdf5 format, but the netcdf driver should try to open them first. If the file has nc/nc2/nc4/cdf suffix, the netcdf driver tries to open the file, and if it fails then the hdf5 driver is used. Normally the netcdf driver is loaded before the hdf5 driver. This works well on my builds, but it doesn't work with the ubuntugis builds. I have traced the source of the problem to the build log at https://launchpadlibrarian.net/122450487/buildlog_ubuntu-oneiric-amd64.gdal_1.9.2-2~oneiric6_BUILDING.txt.gz === checking for nc-config... no did not find nc-config, some features may be missing use --with-netcdf=/path/to/netcdf or add nc-config to PATH checking for nc_open in -lnetcdf... yes === Proper output (which I get by building the same package from source using === checking for nc-config... /usr/bin/nc-config checking libnetcdf compiler and linker flags with nc-config... got version="netCDF 4.1.1", prefix="/usr", libs="-L/usr/lib -lnetcdf", includedir="/usr/include" checking for nc_open in -lnetcdf... yes checking for netcdf-4 (and HDF5) support in libnetcdf... yes === The source of this error is that libnetcdf used for the build lacks nc-config. Thanks, Etienne P.S. You can try with the sample datasets in the gdal autotest : autotest/gdrivers/data/trmm-nc4.nc with gdal-1.9.2-2 from ubuntugis-unstable (oneiric): $ gdalinfo /data/src/gdal/svn/branches/1.9/autotest/gdrivers/data/trmm-nc4.nc Driver: HDF5Image/HDF5 Dataset Files: /data/src/gdal/svn/branches/1.9/autotest/gdrivers/data/trmm-nc4.nc Size is 40, 40 Forcing the use of the netcdf driver works (because libnetcdf does has hdf5 support): $ gdalinfo NETCDF:/data/src/gdal/svn/branches/1.9/autotest/gdrivers/data/trmm-nc4.nc Warning 1: NetCDF driver detected file type=5, but libnetcdf detected type=3 Driver: netCDF/Network Common Data Format Files: none associated Size is 40, 40 with a custom build : $ gdalinfo NETCDF:/data/src/gdal/svn/branches/1.9/autotest/gdrivers/data/trmm-nc4.nc Driver: netCDF/Network Common Data Format Files: none associated Size is 40, 40 _______________________________________________ UbuntuGIS mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/ubuntu http://trac.osgeo.org/ubuntugis/wiki
