From the CF 1.6 Convention, chapter 3.1 Units:

"The units attribute is required for all variables that represent dimensional quantities (except for boundary variables defined in Section 7.1, “Cell Boundaries” and climatology variables defined in Section 7.4, “Climatological Statistics”)."

In the same document, in appendix H.3.4. Contiguous ragged array representation of profiles, the following example appears:

      int profile(profile) ;
          profile:cf_role = "profile_id";

This array obviously contains identification numbers. It is also a dimensional quantity and accordinly the units attribute is mandatory (none of the listed exceptions apply). Are there any unit acceptable by udunits that can be used in this case? The best I have found is "count" which I think is misleading.

Or should this and similar variables also be included in the list of exceptions above?

Best regards,

   Egil Støren
   met.no
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