[CF-metadata] grid cells with a varying number of cell bounds

Jim Biard jbiard at cicsnc.org
Thu Dec 21 08:06:23 MST 2017


I agree with Charlie and Jessica that _FillValue is the better approach. 
According to the NUG, "The fill value is returned when reading values 
that were never written." This contrasts slightly with the missing_value 
definition which is (per NUG) "The missing_value attribute can be a 
scalar or vector containing values indicating missing data." 
Missing_value has more of the sense of "Our acquisition system couldn't 
get a value for this measurement at this time/place."

In the case at hand, there never were values to potentially have. The 
difference between not existing and potentially existing but unavailable.

Grace and peace,


On 12/20/17 6:49 PM, Hausman, Jessica (398G) wrote:
> Matlab, Panoploy and other software know what to do with _/FillValue, 
> I don’t know if the same can be said about missing/_value
> --
> Jessica Hausman
> Jet Propulsion Lab
> 4800 Oak Grove Dr.
> MS 158-242
> Pasadena, CA 91109
> Tel: +1 818-354-4588
> *From: *CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of 
> Charlie Zender <zender at uci.edu>
> *Organization: *University of California, Irvine
> *Date: *Wednesday, December 20, 2017 at 2:35 PM
> *To: *"cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> *Cc: *Karl Taylor <taylor13 at llnl.gov>
> *Subject: *Re: [CF-metadata] grid cells with a varying number of cell 
> bounds
> I prefer _FillValue to missing_value.
> On 12/20/17 14:22, cf-metadata-request at cgd.ucar.edu 
> <mailto:cf-metadata-request at cgd.ucar.edu> wrote:
> > My sense is that no one violently opposes the use of missing_value to
> > fill unused vertices for grid cells with fewer than the maximum number
> > of vertices.
> -- 
> Charlie Zender, Earth System Sci. & Computer Sci.
> University of California, Irvine 949-891-2429 )'(
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