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#104: Clarify the interpretation of scalar coordinate variables -----------------------------+---------------------------------------------- Reporter: jonathan | Owner: [email protected] Type: enhancement | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Resolution: | Keywords: -----------------------------+---------------------------------------------- Comment (by stevehankin): I think this is our question: ''When a scalar coordinate is associated with a data variable through a coordinates attribute, is the proper interpretation that the scalar coordinate is an independent axis of length 1? Or simply a dependent variable?'' The current text is internally contradictory (*). But I like the free wheeling approach that is found in this definition: '''scalar coordinate variable'''[[BR]] A scalar variable that contains coordinate data. Functionally equivalent to either a size one coordinate variable or a size one auxiliary coordinate variable. I suspect that we should continue to live with this ambiguity. To emphasize this perspective consider example H.5 (''Single time series, including deviations from a nominal fixed spatial location'' [http://cf- pcmdi.llnl.gov/documents/cf-conventions/1.6/cf- conventions.html#idp8320208] ) in which scalar variables 'lat' and 'lon' may be regarded as independent or dependent depending on the context in which the file is being used. This ambiguity is (I think) a challenge for the data model rather than for CF, itself. Can it be addressed by redefining some concepts inside of the data model, without altering CF? (So easy to lose track of the question. Sorry if I have.) ==== (*) The text also says: "Scalar coordinate variables have the same information content and can be used in the same contexts as a size one coordinate variable." -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/104#comment:61> 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.
