[CF-metadata] units in cf standard names

Bryan Lawrence b.n.lawrence at rl.ac.uk
Tue Oct 10 03:17:27 MDT 2006


Clearly with CF1.0 we are stuck with udunits.

However, it's worth thinking about the future. I wasn't involved when
the decision to be udunit compatible was made. Can anyone summarise the
benefits that requiring udunit conformance confer on the CF community?

Bryan




On Tue, 2006-10-10 at 09:38 +0200, Christiane Textor wrote:
> Hi Egil,
> 
> This is a good suggestion, however units like kgN/m2/s are not allowed
> in UDunits as far as I know.
> 
> (It is not necessary to give additional information for mole fractions,
> it is only needed for masses.)
> 
> Best regards,
> Christiane
> 
> 
> Egil Støren a écrit :
> > Hi all,
> > 
> > I am following this discussion somewhat from the sideline, but with a 
> > growing feeling of uneasiness. If this X_as_Y naming method is accepted, 
> > then standard names will tend to grow very large. I also think this 
> > method makes the distinction between physical quantities and units less 
> > clear. As I see it, "X_as_Y" and "X_as_such" represents the same 
> > physical quantity, but with different units. I strongly feel that the 
> > "as_Y" part belongs to the units attribute. For example:
> > 
> > standard_name: mass_flux_of_NO2
> > units: moles N/m2/s
> > 
> > This will of course need some changes to CF regarding the units attribute.
> > 
> > Best regards,
> > 
> >    Egil Støren
> >    met.no, Norway
> > 
> > 
> > Jonathan Gregory wrote:
> >> Dear Roy
> >>
> >> Thanks. I note that when you say something is expressed in moles of 
> >> nitrogen
> >> you mean moles of nitrogen atoms, to be precise.
> >>
> >>
> >>> Does the phrase 'expressed_as' do a better job?
> >>
> >>
> >> It does for me, yes. I interpreted X_as_Y as meaning X is what the number
> >> applies to, but it comes in the form of Y, "as" meaning "in form of" like
> >> "water as ice". By X_as_Y you and Christiane mean Y is what the number 
> >> applies
> >> to, taking "as" to mean "expressed as". So it would be better to have
> >> expressed_as, I would say, or any neater alternative if someone has 
> >> one to
> >> suggest.
> >>
> >> Is it going to be OK to have names like 
> >> mass_flux_of_ammonium_expressed_as_such
> >> do you think? Is there a better way to say that?
> >>
> >> Cheers
> >>
> >> Jonathan
> >> _______________________________________________
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> >> CF-metadata at cgd.ucar.edu
> >> http://www.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >>
> > 
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