[CF-metadata] Horizontal Data Coordinate System Definition [long]

[John Caron]

Richard P Signell wrote:

>John & Co,
>
>I think that requiring either ellipsoid paramaters OR EPSG code is a good
>idea, but I'm not sure we should limit the EPSG codes people can use.
>While I agree it would be pretty unreasonable to expect clients to support
>*all* EPSG codes, CF is already so complex that clients will probably only
>implement selected features. The IDV is an example.
>  
>
>If someone wants to write a client that will access the EPSG database and
>implement every projection and transformation in, we shouldn't stop them.
>And also it would be sad to tell people that their model using Swiss
>Oblique Cylindrical coordinates cannot be described with CF. ;-)
>
>-Rich
>  
>
Hi Rich:

I would be ok allowing any EPSG codes, or listing the allowed ones.
Probably the CF principals should decide.