Hi,
Just to let you know, I've added "u" to the UDUNITS-2 prefix database as
a symbol for "micro" to make UDUNITS-2 more backward-compatible with
UDUNITS (alias UDUNITS-1). This addition will be in the next release.
It's still a good idea, however, to use unit names (which are case
insensitive and unambiguous) rather than symbols (which are case
sensitive and potentially ambiguous).
Regards,
Steve Emmerson
On 3/26/2010 9:52 AM, Andrew Clegg wrote:
> Hi Julien,
>
> I'm glad you brought this up. We had a discussion about this recently
> (look for any threads with 'udunits 1 or 2 for CF' in the title):
> http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2010/thread.html
>
> The best solution (in my opinion) was to use expanded names rather than
> shortened, so instead of using 'u' (which has been replaced by '?' in
> udunits2) you would use 'micro' (which is compatible with both). However
> it would be nice to get a consensus on this or another solution, and
> some text added to the conventions.
>
> Cheers,
> Andrew Clegg
>
>
> Julien Demaria wrote:
>> Hi,
>>
>> I found the "u" micro prefix abbreviation in the current CF-1.4
>> documentation on units:
>> http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#units
>>
>>
>> but it seems this prefix is not available in the last udunits-2
>> (udunits-1 is now deprecated)
>>
>> and in udunits-2 they break backward compatibility because the "u"
>> symbol is now used for a new unit "unified_atomic_mass_unit", see in
>> http://www.unidata.ucar.edu/software/udunits/udunits-2/udunits2-accepted.xml
>>
>> http://www.unidata.ucar.edu/software/udunits/udunits-2/udunits2-prefixes.xml
>>
>>
>> So what is the position of the CF community concerning this point, is
>> the "u" micro prefix CF-1.4 compliant or not?
>>
>>
>> Thanks in advance,
>>
>> Julien
>>
>> _______________________________________________
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>> CF-metadata at cgd.ucar.edu
>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
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Received on Fri Mar 26 2010 - 10:53:09 GMT
