[gdal-dev] netcdf driver

[gaffigan at sfos.uaf.edu]

Thanks for requesting input from the masses.  I have two suggestions which
are based on patches I apply to the NETCDF and HDF4 drivers every time I
build GDAL.

I suggest providing a consistent way to georeference grids across the
DODS, NETCDF, HDF4, and HDF5 drivers.  We patch the NETCDF and HDF4
drivers to recognize georeferencing global attributes, "spatial_ref" and
"GeoTransform".  This allows for georeferencing whether accessing data
through these local file drivers or the DODS driver.

http://trac.osgeo.org/gdal/ticket/1639 (frmts/DODS, done)
http://trac.osgeo.org/gdal/ticket/1637 (frmts/NETCDF, pending)
http://trac.osgeo.org/gdal/ticket/2539 (frmts/HDF4, just submitted)

Also, I think there should be a way to specify the values of higher-order
dimensions (time, level, etc.) in the NETCDF connection string, similar to
what the DODS driver allows (e.g.
"http://penguin.sfos.uaf.edu/opendap/forecasts/WRF/APWS4km/AEFF/latest.nc?TMP_GPML[24][0][y][x]").
 The existing ticket #1808 includes this and many other enhancements to
the NETCDF driver.  It would be great to see these enhancements in a
future GDAL release.  Alternatively, the patch in ticket #2540, though
redundant to that above, is a simpler alternative for selecting
individual bands which we have used extensively.

http://trac.osgeo.org/gdal/ticket/1808
http://trac.osgeo.org/gdal/ticket/2540 (just submitted)

Steve Gaffigan
Data Analyst
Alaska Ocean Observing System


> Hi,
>
> I will being doing some new development on netCDF driver to make it more
> CF-1 Compliant.
>
> Note: when I compiled the netCDF 3.6.2  with HDF4.2r3 (with the flag
> --disable-netcdf)  I had to change all macros such as "MAX_NC_NAME" to
> "H4_MAX_NC_NAME" and many other similar macros. Need to do some testing on
> this.
>
> I also noticed that DODS (dodsdataset2.cpp) does not seem to compile with
> libdap3.8.2.  There are some major changes in the library for C++.
> I will take a look into this as well, but do not promess anything...
>
> If you have suggestion of improvements for DODS, HDF4 and netCDF drivers,
> let me know, I have a little bit of time this coming month.
>
> Regards,
> Denis
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