[CF-metadata] When are the units attribute mandatory?

2012-02-16 Thread Egil Støren
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

Re: [CF-metadata] When are the units attribute mandatory?

2012-02-16 Thread John Caron
Hi Egil: My first thought is that its not a dimensional quantity. Why do you think it is? John On 2/16/2012 8:00 AM, Egil Støren wrote: From the CF 1.6 Convention, chapter 3.1 Units: "The units attribute is required for all variables that represent dimensional quantities (except for bounda

Re: [CF-metadata] When are the units attribute mandatory?

2012-02-16 Thread Steve Emmerson
Egil, Units of physical quantities are only meaningful for physical quantities (yes, I know that's a tautology :-). Is the "profile_id" a physical quantity? I wouldn't think so from its name. If it isn't, then a unit attribute would be meaningless and possibly misleading. Regards, Steve Emme

Re: [CF-metadata] When are the units attribute mandatory?

2012-02-17 Thread Egil Støren
Dead John and Steve, Yes, I suppose it is not a dimensional quantity. I am not sure what is meant by this concept, I just assumed it was a variable with dimensions (not a scalar). But I suppose it means something that can refer to a physical property of the four-dimensional space-time. Howev