Dear Thomas > Thus, although I am unsure we should impose it from the convention, e.g. by > allowing to define some attributes from the "umbrella" level (such as > :coordinates), I see little use for defining vector objects that do not share > all their dimensions.
In your umbrella proposal, all the data variables still describe themselves independently, including their grid, and I see that as an advantage. Actually I do think there is a point in permitting one umbrella to shelter components which are on different grids. The Arakawa C-grid is a real use-case. Many models use this arrangement, and CF currently offers no way of grouping the components, although it does of course contain them independently. I think it could be convenient to some software to have an easy way to find the components of a vector on an Arakawa C-grid. It is not essential, but it could be useful, just as when the components are at the same gridpoints. However, I don't feel strongly about it. Best wishes Jonathan _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata