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.hatcher at 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.
>
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>
>
--
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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Received on Fri Jul 20 2018 - 07:13:51 BST
