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#109: resolve inconsistency of positive and standard_name attributes ----------------------------+----------------------------------------------- Reporter: jonathan | Owner: [email protected] Type: defect | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Keywords: | ----------------------------+----------------------------------------------- John Graybeal raised the question of what happens if the `positive` and `standard_name` attributes of a vertical coordinate variable are inconsistent according to the definition of the latter e.g. if `positive="up"` and `standard_name="depth"`, which is defined as vertical distance below the surface, implying that positive is down. Steve Hankin and I discussed this on the CF email list and further by email and phone. We would like to propose the following clarification, which should answer the question without materially changing the convention or invalidating existing data. Append the following to the last paragraph (beginning "Optionally") of introductory part of Section 4.3 (before Section 4.3.1): If both `positive` and `standard_name` are provided, it is recommended that they should be consistent. For instance, if a depth of 1000 metres is represented by -1000 and `positive` is `up`, it would be inconsistent to give the `standard_name` as `depth`, whose definition (vertical distance below the surface) implies positive down. If an application detects such an inconsistency, the user should be warned, and the `positive` attribute should be used to determine the sign convention. Insert the following into Section 4.3 of the conformance document: Recommendations: The `positive` attribute should be consistent with the sign convention implied by the definition of the `standard_name`, if both are provided. There is no general way to check consistency at present. Jonathan -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/109> 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.
