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#95: Development of CF 1.5 Data Model -----------------------------+---------------------------------------------- Reporter: markh | Owner: [email protected] Type: task | Status: new Priority: medium | Milestone: Component: cf-conventions | Version: Resolution: | Keywords: -----------------------------+---------------------------------------------- Comment (by markh): Replying to [comment:48 davidhassell]: Hello David I am struggling more with the proposal of an unordered collection of !DomainAxis instances than i have with an ordered one. I thought one of the objectives was to define the Field's data array, without domain axis ordering this seems not to be delivered. I think if we are to define the !DomainAxis construct the Field must define an ordered list of them as its domain_axes. The instance of a Field from my example which you have described does not deliver on some key aspects I require, I will try to explain how: * the ordering of the dimensions defined by the height_level and time coordinates is not defined; * my Fields will become extensive in height_level and time, during aggregation; how would my ggregator know which way round to order these dimensions in the data array? * you have defined forecast_period and forecast_reference_time as functions of t, suggesting a link to the time coordinate. * one of these two coordiantes is independent of time, while the other is a function of both time and the previously mentioned coordinate independent of time. * which is which is either decided by inspection of the data during aggregation or by user preference stated to the aggregator * you have defined source and institute as functions of the domain_axis defined by an ensemble_member coordinate: * this is explicitly not the case, these coordinates are not stated to vary with any other coordinates Does your interpretation of the model allow for a coordinate which has only 1 data value and is not a function of any !DomainAxis? Also, when comparing Fields: * do the domain axis identifiers form part of the comparison criteria? * do the domain axes a coordinate is a function of form part of the comparison criteria? thank you mark -- Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/95#comment:49> 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.
