Hello Ros, Thanks for describing this defect, and I support your fix.
All the best, David On 19 July 2018 at 14:37, Rosalyn Hatcher <r.s.hatc...@reading.ac.uk> wrote: > Hi All, > > I've noticed some ambiguity in the CF document around the use of the > "cf_role" attribute which I think needs clarification. > > In Appendix A it states that the *cf_role* attribute is valid for use on > a coordinate variable only, however, in virtually, if not all, the examples > in Appendix H cf_role is not attached to a coordinate variable. > E.g. H.2 > > dimensions: > station = 10 ; // measurement locations > time = UNLIMITED ; > variables: > float humidity(station,time) ; > humidity:standard_name = "specific humidity" ; > humidity:coordinates = "lat lon alt" ; > double time(time) ; > time:standard_name = "time"; > time:long_name = "time of measurement" ; > time:units = "days since 1970-01-01 00:00:00" ; > float lon(station) ; > lon:standard_name = "longitude"; > lon:long_name = "station longitude"; > lon:units = "degrees_east"; > float lat(station) ; > lat:standard_name = "latitude"; > lat:long_name = "station latitude" ; > lat:units = "degrees_north" ; > float alt(station) ; > alt:long_name = "vertical distance above the surface" ; > alt:standard_name = "height" ; > alt:units = "m"; > alt:positive = "up"; > alt:axis = "Z"; > char station_name(station, name_strlen) ; > station_name:long_name = "station name" ; > station_name:cf_role = "timeseries_id"; > attributes: > :featureType = "timeSeries"; > > > I think the cf_role variable "station_name" should be named by the > coordinates attribute for humidity. > > Moreover, section 9.5 in the conventions document, 2nd paragraph, it > should say "Where feasible a coordinate or auxiliary coordinate variable > with the attribute cf_role should be included." > > Assuming there are no objections I'll raise a defect ticket when Trac is > back. > > Regards, > Ros. > > _______________________________________________ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > > -- David Hassell National Centre for Atmospheric Science Department of Meteorology, University of Reading, Earley Gate, PO Box 243, Reading RG6 6BB Tel: +44 118 3785183 http://www.met.reading.ac.uk/
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