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#98: Clarify constraints on ancillary variable use ----------------------------+----------------------------------------------- Reporter: markh | Owner: [email protected] Type: defect | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Keywords: | ----------------------------+----------------------------------------------- == 1. Title == Clarify constraints on ancillary variable use == 2. Moderator == required == 3. Requirement == An ancillary variable should not be able to be referenced by a data variable in the case where the ancillary variable is defined with respect to NetCDF file dimensions which the data variable with the referencing ancillary_variables attribute is not defined with respect to. For example, if {{{ data(x,y,z) anc(x,y,t) }}} then data may not have an attribute of {{{ data:ancillary_variables = "anc" }}} The dimensions '''anc''' is defined with respect to are not the set or a subset of the dimensions '''data''' is defined with respect to so it cannot be an ancillary variable of '''data'''. == 4. Initial Statement of Technical Proposal == [http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/ch03s04.html Ancillary Variables] '''additional text:''' For a variable in a NetCDF file to be referenced as an ancillary_variable by a data variable, this ancillary variable must be defined with respect to the set, or a subset of the dimensions defining the referencing data variable. == 5. Benefits == The limitations on use of Ancillary Variables will be made clear and explicit and may be checked for compliance by software. == 6. Status Quo == None Available. Currently compliant files may be created but not be understood by data users. -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/98> 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.
