File saved as netcdf-4 despite choosing format='NETCDF3_CLASSIC'

[dopplershift]

From sourish....@gmail.com on February 19, 2010 07:40:14

What steps will reproduce the problem? 1. Store the attached file AL20_ROBS_1979 and the script Convert.py in the
same directory.
2. From ipython shell, '%run Convert'
3. Check the format of the input and output files using 'ncdump -k
AL20_ROBS_1979' and 'ncdump -k AL20_ROBS_1979-processed.nc' What is the expected output? What do you see instead? I expect the input and output files to have the same format, namely
NETCDF3_CLASSIC, since the output file was created with an explicit
'format=' parameter to match the input file format. However, the output
file is a netcdf-4 file. The same thing happens if on line 8 of Convert.py
I explicitly specify format='NETCDF3_CLASSIC'. The output file is still
netcdf-4. What version of the product are you using? On what operating system? netcdf-4.1-rc1
netCDF4-0.9
64-bit ubuntu linux

Attachment: AL20_ROBS_1979 Convert.py

Original issue: http://code.google.com/p/netcdf4-python/issues/detail?id=40

[dopplershift]

From whitaker.jeffrey@gmail.com on February 19, 2010 07:57:46

When I run your script, I get the expected result

[mac28:/Downloads] jwhitaker% ncdump -k AL20_ROBS_1979-processed.nc
classic
[mac28:/Downloads] jwhitaker% ncdump -k AL20_ROBS_1979
classic

this is with netcdf-4.1 (the buggy release that was recently pulled from the ftp site).
I don't have 4.1rc1 on this machine, but I doubt that would make a difference.

[dopplershift]

From sourish....@gmail.com on February 23, 2010 04:01:22

I asked a colleague of mine, and she has the same problem as I do -- the script saves
a netcdf4 file. For her, the versions are:

In [9]: netCDF4.version
Out[9]: '0.8.2'

In [10]: netCDF4.getlibversion()
Out[10]: '4.1-beta2 of Oct 22 2009 17:33:27 $'

whereas for me the versions are:

3: '4.1-rc1 of Feb 14 2010 07:56:44 $'

So the common thing seems to be the 4.1-blah version of the underlying library. I
will try today with 4.0.1 and see if I still have the same problem.

[dopplershift]

From sourish....@gmail.com on February 23, 2010 04:42:10

I just installed netcdf-4.0.1 and python-netcdf4 on top of it, and my problem
disappeared! Now the output file shows a 'classic' format as well. If and when you
have the time and opportunity to install 4.1-rc1, could you please verify?

[dopplershift]

From whitaker.jeffrey@gmail.com on February 23, 2010 04:55:16

It works correctly for me with 4.1-rc1/HDF5 1.8.4

-Jeff

[dopplershift]

From whitaker.jeffrey@gmail.com on February 25, 2014 18:04:09

Status: Fixed