Dear all This is partly a reply to various off-list emails.
I don't believe that the current CF standard says anything specifically about ensemble axes. We did discuss introducing axis="E" but that wasn't adopted. The axis attribute is generally redundant (the same came be deduced from mandatory units, positive att or standard_name). I think it would be better to use the standard_name to indicate an ensemble axis, whether collapsed or not. Jamies Kettleborough has reminded us that we introduced the standard_name of realization for ensemble members. (I did have a memory of that, but I searched the table for a spelling with S rather than Z!) So I withdraw my suggestion of new standard names for this. I think that the existing convention permits a cell_methods entry of "realization: METHOD", when there is no dimension named "realization", to indicate that an ensemble axis has been collapsed using the METHOD stated. In the case where a cell_methods entry gives a name that is not a dimension name, it's interpreted as a standard name, and it means "over all available values". Cheers Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
