Hi Simon, sorry that I havent been clear enough:
True:
nj22 implements the CDM data access layer
the CDM data access layer is the same as the NetCDF-4 data model
Not true (yet):
nj22 implements NetCDF-4
Details:
When the NetCDF-4 file format is finalized (waiting on HDF5-1.8), then nj22
will be able to read NetCDF-4. It will not immediately be able to write, and
depending on how complicated things are (HDF5 is pretty complicated, esp
compared to netcdf-3), it may end up only only writing a subset of netcdf-4. I
would guess eventually it will write the whole thing, but that will depend on
funding. There has never been an independent library that writes (or reads)
HDF5, so we are wary of promising what hasnt been done before. We have
prototyped HDF5 reading enough to know we can do that.
John
Simon Wood wrote:
Hi,
I'm trying to clarify the functionality of the latest release of nj22
(eg nj-2.2.17) WRT netCDF-4.
According to some of the CDM docs I've seen (eg
http://www.unidata.ucar.edu/staff/caron/presentations/CDM.ppt, slide 39)
nj22 implements the CDM data access layer (ie netCDF-4) 'to beta
quality' but is awaiting HDF5-1.8. I assumed this to mean both reading
*and* writing, yet on the the nj22 web page
(http://www.unidata.ucar.edu/software/netcdf-java/) it seems to be
suggested that only reading of netCDF-4 files is supported with writing
being restricted to netCDF-3. Which is correct? Or have I missed
something here?
regards
Simon Wood
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