Hello Jonathan,
I think the weights are the same kind of quantity even if they are
calculated different ways - just as air_temperature is considered the
same quantity even if calculated from a GFDL model or a ECMWF model
(with different start conditions, numerical schemes, physical
parametrisations). So I think they should have the same standard name -
if we go that way.
Steve - can you give more information on the use of masks - the only
references I can find to mask in the CF do are related to compression by
gathering (sec 8.2) which is distinct to the weights problem.
Jamie
On Sun, 2007-02-11 at 21:59 +0000, Bryan Lawrence wrote:
> Oh, I'm not arguing for against the method of encoding the realization
> my point is simply that we have not chosen to have different standard
> names in the situation where cell methods are different, and I would
> have thought the same argument applied to realization weights, however
> we encode them.
>
> On Fri, 2007-02-09 at 10:31 -0800, Steve Hankin wrote:
> > I think Jonathan hit on the fundamental distinction when he noted:
> > "since it
> > isn't related to the grid or computed in any way from coordinates, but depends
> > more on data variables, it isn't really a cell_measure"
> > Among current CF concepts closest analogy to "realization_weights" is
> > not a cell measure. It is a mask -- a1-dimensional weighted mask that
> > is derived from the data. Two dimensional derived masks have been
> > commonplace in the analysis of COARDS and CF datasets for many years,
> > though they have little formal discussion in the CF document, itself.
> > The proper place for the "realization_weights" concept in the CF
> > taxonomy is to formalize the concepts behind masks, imho.
> >
> > - Steve
> >
> > ================================================
> >
> > Bryan Lawrence wrote:
> > > > If the different ways of calculating realization_weights produce distinct
> > > > scientific quantities, as I suppose they do, then they should have
> > > > different standard_names, so you can tell them apart.
> > > >
> > >
> > > How is that different from differing methods of cell methods with the
> > > same standard names?
> > >
> > > Bryan
> > > _______________________________________________
> > > CF-metadata mailing list
> > > CF-metadata at cgd.ucar.edu
> > > http://www.cgd.ucar.edu/mailman/listinfo/cf-metadata
> > >
> >
> > --
> > --
> >
> > Steve Hankin, NOAA/PMEL -- Steven.C.Hankin at noaa.gov
> > 7600 Sand Point Way NE, Seattle, WA 98115-0070
> > ph. (206) 526-6080, FAX (206) 526-6744
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Received on Mon Feb 12 2007 - 02:37:45 GMT
