[gdal-dev] netCDF multi-dimensional support

[Simon Eves]

I am trying to build GDAL 3.4.0 with "full" netCDF support, but getting
different results on my two machines, both Ubuntu 20.04 with
supposedly-the-same dev environment.

Both have the libnetcdf-dev (4.7.3) apt package installed, and both have
working nc-config, which reports the same thing on both.

I am configuring GDAL as follows:

./configure --prefix=$PREFIX --without-geos --with-libkml=$PREFIX
--with-proj=$PREFIX --with-libtiff=internal --with-geotiff=internal
--with-netcdf=yes

Both configure logs attached.
____________________________________________________________________

OLD (works)

$ apt list --installed | egrep -i "hdf|cdf"
hdf5-helpers/focal,now 1.10.4+repack-11ubuntu1 amd64 [installed,automatic]
libhdf4-0-alt/focal,now 4.2.14-1ubuntu1 amd64 [installed,automatic]
libhdf4-alt-dev/focal,now 4.2.14-1ubuntu1 amd64 [installed,automatic]
libhdf5-103/focal,now 1.10.4+repack-11ubuntu1 amd64 [installed,automatic]
libhdf5-cpp-103/focal,now 1.10.4+repack-11ubuntu1 amd64
[installed,automatic]
libhdf5-dev/focal,now 1.10.4+repack-11ubuntu1 amd64 [installed,automatic]
libnetcdf-dev/focal,now 1:4.7.3-1 amd64 [installed,automatic]
libnetcdf15/focal,now 1:4.7.3-1 amd64 [installed,automatic]

$ gdalinfo --formats | egrep -i "hdf|cdf"
GMT -raster- (rw): GMT NetCDF Grid Format
netCDF -raster,multidimensional raster,vector- (rw+vs): Network Common Data
Format
HDF4 -raster,multidimensional raster- (ros): Hierarchical Data Format
Release 4
HDF4Image -raster- (rw+): HDF4 Dataset
HDF5 -raster,multidimensional raster- (rovs): Hierarchical Data Format
Release 5
HDF5Image -raster- (rov): HDF5 Dataset

$ gdalinfo file.nc | head -1
Driver: netCDF/Network Common Data Format

File imports fine
____________________________________________________________________

NEW (problematic)

$ apt list --installed | egrep -i "hdf|cdf"
hdf5-helpers/focal,now 1.10.4+repack-11ubuntu1 amd64 [installed,automatic]
libhdf5-103/focal,now 1.10.4+repack-11ubuntu1 amd64 [installed,automatic]
libhdf5-cpp-103/focal,now 1.10.4+repack-11ubuntu1 amd64
[installed,automatic]
libhdf5-dev/focal,now 1.10.4+repack-11ubuntu1 amd64 [installed,automatic]
libnetcdf-dev/focal,now 1:4.7.3-1 amd64 [installed]
libnetcdf15/focal,now 1:4.7.3-1 amd64 [installed,automatic]

$ gdalinfo --formats | egrep -i "hdf|cdf"
GMT -raster- (rw): GMT NetCDF Grid Format
netCDF -raster,vector- (rw+s): Network Common Data Format
HDF5 -raster,multidimensional raster- (rovs): Hierarchical Data Format
Release 5
HDF5Image -raster- (rov): HDF5 Dataset

$ gdalinfo file.nc | head -1
Driver: HDF5/Hierarchical Data Format Release 5

Some sub-datasets will not open
____________________________________________________________________

Note that the old machine already had HDR4 libs (and consequentially GDAL
built with support for that too, even though I did not explicitly reqiuest
HDF4 or HDF5 support in the configure), which may be the issue, although I
am loath to just install HDF4 on the new (freshly built two weeks ago)
machine if I don't need to.

On the old machine, gdalinfo reports the file as netCDF just fine, and the
netCDF driver claims to have multi-dimensional support. The driver on the
new one does not, and the file reports as plain HDF5, and some sub-datasets
will not open (presumably multi-dimensional ones!)

I am failing to find anything in the docs about the dependency chain here,
or anything about having to explicitly enable multi-dimensional support in
the build.

I don't know if the netCDF file in question is public-domain, so I would
rather not send it to you at this time. I can find out, if that would help,
although I doubt the file itself is the issue.

Please advise. Thanks! :)

Simon

-- 
<http://www.omnisci.com/>
Simon Eves
Senior Graphics Engineer, Rendering Group
100 Montgomery St (5th Floor), San Francisco, CA 94104, USA


Email: simon.eves at omnisci.com | Cell:  +1 (415) 902-1996
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