Joe,
Do you really need to store more than one large variable in your
Netcdf-3 file? Netcdf-3 allows a single fixed or record variable as
large as 8 Eib. This is true even in the Netcdf-3 classic format.
I have made large Netcdf-3 classic files like this, with complete
satisfaction.
Dave Allured
CU/CIRES Climate Diagnostics Center (CDC)
http://cires.colorado.edu/science/centers/cdc/
NOAA/ESRL/PSD, Climate Analysis Branch (CAB)
http://www.cdc.noaa.gov/
Joe Sirott wrote:
Hi Roy,
There's still a limit on variable sizes with netcdf 3.6 of 4 GB (though
not 2GB as I mentioned):
http://www.unidata.ucar.edu/software/netcdf/faq-lfs.html#Large%20File%20Support10
And I'm also guessing (John C: feel free to correct me) that it's 2GB in
Java due to the lack of unsigned integers.
Cheers, Joe
Roy Mendelssohn wrote:
Hi Joe:
See http://www.unidata.ucar.edu/software/netcdf/docs/faq.html#Large%20File%20Support0.
It has been possible since netcdf3.6
Regards,
-Roy M
On Feb 26, 2008, at 1:11 PM, Joe Sirott wrote:
Hi,
In the "classic" netCDF file format (netCDF-3), a variable without a
record dimension cannot be larger than 2GB. This limitation has been
giving me a lot of headaches lately. I know that netCDF-4 is supposed to
solve this problem, but there are a number of reasons why netCDF-4 is
not a good option for me (no Java write support, for one).
I could be missing something, but it seems like a very small change to
the netCDF-3 file format would solve this problem. The only requirement
would be changing the variable size info in the netCDF header from a 32
bit to a 64 bit int (and, of course, updating the version info in the
header).
I'm guessing that I'm not the only netCDF user who has run into this
problem and who is also reluctant to move to netCDF-4. Any possibility
that Unidata could make these changes?
Cheers,
Joe S.
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NOAA/NMFS
Environmental Research Division
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