#156: Extension to external_variables Syntax for Masks and Area Fractions
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Reporter: martin.juckes | Owner: cf-conventions@…
Type: enhancement | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords:
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Comment (by martin.juckes):
On reflection, the above proposal does not cater for those who may wish to
store the mask or area fraction variable in the same file, so it would be
better to have a means of identifying this variable without relying on the
`external_variables` attribute. This could be done in the
`cell_methods`string, with an extension to the vocabulary for standardized
information in parenthesis: `area: mean where sea_ice (variable: siconc)`.
The preferred approach would then be for `siconc` to be a variable in the
file, while it would be possible to use `external_methods` for CMIP files
which have the the mask variables in different files. The variable
indicated in the `(variable: ..)` construct should have dimensions
compatible with the variable carrying the `cell_methods` attribute.
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Ticket URL: <http://cf-trac.llnl.gov/trac/ticket/156#comment:2>
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