Dear Mark et al. Yes, there are some standard names which imply string values, as Karl says. If the standard_name table says 1, that means the quantity is dimensionless, so it's also fine to omit the units, as Jim says.
Coordinate variables (as distinct from aux coord vars) have to be monotonic, and that implies unique. Aux coord values do not have to be either monotonic or unique. String-valued coord vars can only be auxiliary. Best wishes Jonathan ----- Forwarded message from John Caron <[email protected]> ----- > Date: Sun, 5 Oct 2014 04:37:48 -0600 > From: John Caron <[email protected]> > To: "Hedley, Mark" <[email protected]> > CC: "[email protected]" <[email protected]> > Subject: Re: [CF-metadata] string valued coordinates > > >I understand that netCDF coordinate variables have to be strictly > monotonic, and no-one wants to define what this means for the general case > of strings; that is fine. > > in CDM, monontonicity is required to make the 1D coordinate maps > invertible. For string valued coordinates, the equivilent requirement is > uniqueness. Im not sure if CF data model states this or not. > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ----- End forwarded message ----- _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
