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shortened, so instead of using 'u' (which has been replaced by 'ยต' in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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