Jonathan,
I had seen that language in that first paragraph, but there is no
explicitly prohibitive or limiting language. There is no place in the
document where it is stated that the "/name: method/ where /type/"
construction only applies when the /name/ references a spatial
coordinate or combination (such as area). You didn't intend it to be
applied otherwise, but a straight reading of the conventions doesn't
prohibit it. And, strictly speaking, if the producer's intent was to
indicate that the time average was constrained by instantaneous spatial
constraints, the application of the 'where' clause could still be
construed as applying to portions of area.
But putting fine-grained readings of the conventions aside and accepting
your constraints, I guess that mean any such description relating to the
time axis should be handled with a comment clause. Is that right?
Grace and peace,
Jim
On 3/16/16 12:29 PM, Jonathan Gregory wrote:
Dear Jim
I can see where your assumption about the where clause comes from,
but I don't find any such restriction declared in the conventions.
We didn't have anything in mind other than portions of area. Sect 7.3.3 begins
By default, the statistical method indicated by cell_methods is assumed to have
been evaluated over the entire horizontal area of the cell. Sometimes, however,
it is useful to limit consideration to only a portion of a cell (e.g. a mean
over the sea-ice area).
which is explicitly about horizontal area. I agree that the concept could be
extended to other dimensions or combinations of dimensions, but it has not
been so far.
Best wishes
Jonathan
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