[CF-metadata] Re: grid mappings

From: Steve Hankin <hankin>
Date: Sun, 02 Mar 2003 15:27:45 -0800

Jonathan,

Would you mind sending out a cleaned up summary of where the grid mapping standard
stands now? Sorry for suggesting nuisance work, but I'm sure it will prove
worthwhile. CF has taken on an importance in the community that makes it vital to
ensure that the logic of discussions can be retraced and discussed later. CF is a
case-in-point of the type of standards evolution we need to be promoting: fewer
standards, but standards that are broader and more interoperable. That's what is
needed to fuse together the communities that currently don't exchange data well.
The challenge of promoting that evolution is that decisions need to be exposed and
discussed within broader communities -- i.e a better public review process.

    thanks - steve

========================

Jonathan Gregory wrote:

> Dear All
>
> My views are evidently a minority opinion so I'll vote for John and Russ's
> scheme too. Anyway I feel happier about the issues now as a result of the
> discussion - thanks everyone for your patience and time.
>
> I would like to propose that the attributes defining the grid mapping, which
> can only be used on a grid mapping variable, should be listed in a separate
> appendix from the other attributes, for clarity. Conversely, the attributes
> listed in appendix A cannot be used on a grid mapping variable.
>
> I'd also support Brian's modification of the proposal, to use lower case for
> all the attribute and mapping names, as elsewhere in the CF standard.
>
> The grid mappings which have been requested so far are these:
>
> Lambert conformal
> transverse Mercator
> polar stereographic
> Albers equal area
> rotated pole
>
> conformal cubic
> stretched grid (as in the Arpege model)
>
> I would suggest we start with the first five. The first four are in proj, which
> we can use a source for their parameter definitions, and the rotated pole we
> already have in CF. I have references for the last two, which we can add soon.
> Two other possibilities are the GME grid and the CSU hexagonal grid.
>
> Best wishes
>
> Jonathan
Received on Sun Mar 02 2003 - 16:27:45 GMT