Re: [netcdfgroup] Specification for NC_64BIT_DATA format

• To: Stephan Hoyer <shoyer@xxxxxxxxx>, netCDF Mail List <netcdfgroup@xxxxxxxxxxxxxxxx>
• Subject: Re: [netcdfgroup] Specification for NC_64BIT_DATA format
• From: Dennis Heimbigner <dmh@xxxxxxxx>
• Date: Mon, 30 Jul 2018 16:33:34 -0600

=Dennis Heimbigner
  Unidata

On 7/30/2018 3:49 PM, Stephan Hoyer wrote:

The documentation for netCDF4-Python writes:

'NETCDF3_64BIT_DATA' is the 64-bit data version of the netCDF 3 file format, which supports 64-bit dimension sizes plus unsigned and 64 bit integer data types, but is only compatible with clients linked against netCDF version 4.4.0 or later.

This seems generally useful, so I'm interested in implementing support for this format in the netCDF3 module included in SciPy:

http://scipy.github.io/devdocs/generated/scipy.io.netcdf_file.html

However, I can't seem to find a description of this format in the netCDF file format specification:

https://www.unidata.ucar.edu/software/netcdf/docs/file_format_specifications.html

Is a full specification for this variation available somewhere? If not, I would encourage updating the specifications doc. One of the strengths of netCDF (especially netCDF3) is that it is clearly specified and has multiple independent implementations :).

Cheers,
Stephan


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• References:
  • [netcdfgroup] Specification for NC_64BIT_DATA format
    • From: Stephan Hoyer