Ajay,
I think this is an exception to CF. I recommend using _FillValue or
missing_value on the time coordinate. Document this in a comment attribute
on the time coordinate variable.
Also document this somehow in another global attribute that explains you
made this exception to the CF conventions. Follow CF conventions in all
other regards.
Then, try to remember to warn people about this when you distribute the
data. CF compliant time coordinates are fundamental to many application
programs, and I expect they will choke or introduce subtle errors if
missing values are in there. So users will need to provide special
handling for such files. HTH.
--Dave
(Please reply to list only)
On Tue, Oct 25, 2016 at 12:07 PM, Ajay Krishnan - NOAA Affiliate <
ajay.krishnan at noaa.gov> wrote:
> Hi All,
>
> I have a user that's converting some IMMA format files to CF compliant
> NetCDF files.
>
> The problem is that, we've run into several measurements where just the
> hour of measurement has been recorded without the corresponding "date". We
> would prefer not to omit these data in the conversion, because they are
> considered valid measurements (and play a role in monthly summary
> statistics)
>
> How do we represent this in a valid CF NetCDF format since we can't use
> _FillValues for 'time'? Any suggestions for handling such special cases?
>
> Thanks,
> Ajay
>
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