Hi.
It appears that the requirements and recommendations section 6.1 is confusing label coordinate variables and label variables that are designated as auxiliary coordinates. There's actually some other things in the discussion of coordinate variables that appear to be confusing or in error. As an example, there is a recommendation in section 5 that speaks of multi-dimensional coordinate variables. I didn't think there was any such thing. There are multi-dimensional variables that are declared as auxiliary coordinates to another variable, but the restrictions associated with true coordinate variables don't attach to them. (The statement itself - that there shouldn't be a match between the name of the variable and any of the names of its dimensions, is true; but I think that's true for all non-coordinate variables.)
Grace and peace,
Jim
Jim Biard
Research Scholar
Cooperative Institute for Climate and Satellites
Remote Sensing and Applications Division
National Climatic Data Center
151 Patton Ave, Asheville, NC 28801-5001
jim.biard at noaa.gov
828-271-4900
On Aug 23, 2012, at 3:03 AM, Michael Decker wrote:
> Hi everyone,
>
> I just had a look at the definition of label variables in the CF-1.6
> Document.
> In paragraph 6.1 it says: "The inner dimension (last dimension in CDL
> terms) is the maximum length of each string, and the other dimensions
> are axis dimensions."
> This leads me to believe that a label variable could have any number of
> dimensions (starting at 1 for the string length). However, I have never
> seen an example that uses label variables with more than two dimensions.
>
> The paragraph from the conventions document is summarized in the
> requirements and recommendations list as follows:
> "6.1 Labels
> Requirements:
>
> A variable of character type that is named by a coordinates
> attribute is a label variable. This variable **must have one or two**
> dimensions. The trailing (CDL order) or sole dimension is for the
> maximum string length. If there are two dimensions, leading dimension
> (CDL order) must match one of those of the data variable."
>
> So this clearly states that the dimensionality of a label variable
> should be either 1 or 2. Which one is right? Does anyone have an example
> for a label variable with more than two dimensions?
>
> Regards,
> Michael
>
> --
> Michael Decker
> Forschungszentrum J?lich
> Institut f?r Energie- und Klimaforschung - Troposph?re (IEK-8)
>
> E-Mail: m.decker at fz-juelich.de
>
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Received on Thu Aug 23 2012 - 07:39:36 BST
