Hi Kyle,
This metadata looks correct to me. I think this is a CF Checker issue. It
seems possible that it could be made to recognize variables that are
associated with defining dimensionless vertical coordinates. There is some
complexity though in that it would need special coordinate specific
knowledge about which variables in the formula_terms attribute are
dimensionless and which are not. But the number of defined coordinates
isn't that large, so this seems doable.
Brian
On Wed, Feb 23, 2011 at 01:59:01PM -0500, Kyle Olivo wrote:
> >So I'm wondering
> >whether the coordinate variable, lev(lev), has the standard_name and
> >formula_terms attributes that should allow the checker to recognize them.
> From the file:
> > double lev(lev) ;
> > lev:bounds = "lev_bnds" ;
> > lev:units = "1" ;
> > lev:axis = "Z" ;
> > lev:positive = "down" ;
> > lev:long_name = "hybrid sigma pressure coordinate" ;
> > lev:standard_name =
> >"atmosphere_hybrid_sigma_pressure_coordinate" ;
> > lev:formula = "p = a*p0 + b*ps" ;
> > lev:formula_terms = "p0: p0 a: a b: b ps: ps" ;
> > double lev_bnds(lev, bnds) ;
> > lev_bnds:formula = "p = a*p0 + b*ps" ;
> > lev_bnds:standard_name =
> >"atmosphere_hybrid_sigma_pressure_coordinate" ;
> > lev_bnds:units = "1" ;
> > lev_bnds:formula_terms = "p0: p0 a: a_bnds b:
> >b_bnds ps: ps" ;
>
> - Kyle
>
> On 02/23/2011 01:37 PM, Brian Eaton wrote:
> >The checker also didn't recognize that the "a" and "b" variables are being
> >used to describe a dimensionless vertical coordinate. So I'm wondering
> >whether the coordinate variable, lev(lev), has the standard_name and
> >formula_terms attributes that should allow the checker to recognize them.
> >
> >Brian
> >
> >
> >On Wed, Feb 23, 2011 at 06:17:01PM +0000, Jonathan Gregory wrote:
> >>Dear Karl et al
> >>
> >>To me it looks like the checker couldn't tell that they were bounds variables,
> >>because there is no bounds attribute pointing to them. They look like data
> >>variables.
> >>
> >>Best wishes
> >>
> >>Jonathan
> >>
> >>On Wed, Feb 23, 2011 at 09:48:21AM -0800, Karl Taylor wrote:
> >>>Date: Wed, 23 Feb 2011 09:48:21 -0800
> >>>From: Karl Taylor<taylor13 at llnl.gov>
> >>>User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US;
> >>> rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7
> >>>To: Kyle Olivo<Kyle.Olivo at noaa.gov>
> >>>CC: aparna Radhakrishnan<Aparna.Radhakrishnan at noaa.gov>,
> >>> "cf-metadata at cgd.ucar.edu"<cf-metadata at cgd.ucar.edu>, "Doutriaux,
> >>> Charles"<doutriaux1 at llnl.gov>
> >>>Subject: Re: [CF-metadata] CF Standards
> >>>
> >>>Hi all,
> >>>
> >>>If a, b, a_bnds, and b_bnds are dimensionless (and I think they
> >>>are), then CF should not raise an error that "no units attribute
> >>>set". Does anyone disagree?
> >>>
> >>>thanks,
> >>>Karl
> >>>
> >>>On 2/23/11 6:55 AM, Kyle Olivo wrote:
> >>>>Hi Charles,
> >>>>
> >>>>We recently CMORized the Amon variable clw and noticed that the output
> >>>>doesn't seem to adhere to CF standards.
> >>>>
> >>>>> double a_bnds(lev, bnds) ;
> >>>>> a_bnds:long_name = "vertical coordinate formula term:
> >>>>>a(k+1/2)" ;
> >>>>> double b_bnds(lev, bnds) ;
> >>>>> b_bnds:long_name = "vertical coordinate formula term:
> >>>>>b(k+1/2)" ;
> >>>>> double a(lev) ;
> >>>>> a:long_name = "vertical coordinate formula term: a(k)" ;
> >>>>> double b(lev) ;
> >>>>> b:long_name = "vertical coordinate formula term: b(k)" ;
> >>>>CF-Checker results:
> >>>>
> >>>>>------------------
> >>>>>Checking variable: a
> >>>>>------------------
> >>>>>ERROR (3.1): No units attribute set
> >>>>>------------------
> >>>>>Checking variable: a_bnds
> >>>>>------------------
> >>>>>ERROR (3.1): No units attribute set
> >>>>>------------------
> >>>>>Checking variable: b
> >>>>>------------------
> >>>>>ERROR (3.1): No units attribute set
> >>>>>------------------
> >>>>>Checking variable: b_bnds
> >>>>>------------------
> >>>>>ERROR (3.1): No units attribute set
> >>>>Any advice on how to proceed on this? Should a units value of some kinds
> >>>>have been included in the Amon MIP table?
> >>>>
> >>>>Thanks,
> >>>>Kyle
> >>>>
> >>>_______________________________________________
> >>>CF-metadata mailing list
> >>>CF-metadata at cgd.ucar.edu
> >>>http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> >>_______________________________________________
> >>CF-metadata mailing list
> >>CF-metadata at cgd.ucar.edu
> >>http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
> --
> Kyle Olivo
> Modeling Services Group
> Geophysical Fluid Dynamics Lab
> o: 609-452-5316 | c: 541-450-9010
>
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Received on Wed Feb 23 2011 - 14:49:30 GMT
