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#74: Allow sharing of ancillary variables among multiple data variables ---------------------------------------+------------------------------------ Reporter: [email protected] | Owner: [email protected] Type: enhancement | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Resolution: | Keywords: "ancillary data" "standard name modifiers" ---------------------------------------+------------------------------------ Comment (by jonathan): Dear Jim We are not talking about a change of intention or interpretation of either attribute. `cell_methods` and `standard_name` are both original parts of the CF convention, and `cell_methods` has always included `standard_deviation`, `variance`, `minimum` and `maximum` as well as `point` and `mean`, for instance. The standard name is not the whole description. For instance, a commonly discussed quantity is the daily maximum of screen-height temperature. In CF, this is described by `standard_name` of `air_temperature`, `cell_methods` of `time: maximum`, and a `height` coordinate of 2.0 m (or 1.5 m, or whatever it was). It has been recognised in other discussions that there may also be a need to identify groups of metadata like this which together characterise a quantity. That was discussed under the "common concepts" trac ticket, which wasn't concluded, and more recently a method has been proposed in the [https://cf-pcmdi.llnl.gov/trac/ticket/94 CF standard string] ticket. It would be nice to conclude that one! However, in this ticket, if my suggestion that standard error of measurement is analogous to standard deviation in other dimensions doesn't seem natural to anyone else, it's obviously not the right approach to take. I was hoping to get rid of `standard_name` modifiers entirely, but we don't have to if we can't devise a better way. We could go back to the proposal as Randy had it at around [https://cf- pcmdi.llnl.gov/trac/ticket/74#comment:33 comment 33], on which we largely agreed, I think, which solves the problem for Randy's applications and would leave `standard_error` as a modifier. Cheers Jonathan -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/74#comment:47> CF Metadata <http://cf-pcmdi.llnl.gov/> CF Metadata This message came from the CF Trac system. To unsubscribe, without unsubscribing to the regular cf-metadata list, send a message to "[email protected]" with "unsubscribe cf-metadata" in the body of your message.
