Hello @JimBiardCics 

>  It might be useful to provide an example that used a projected CRS WKT.

There is a useful example in the conventions at example 5.12 in section 5.6.1 
http://cfconventions.org/cf-conventions/cf-conventions#use-of-the-crs-well-known-text-format

this would be updated, with the line:
* ~~temp:grid_mapping = "crs" ;~~

replaced with the line
*     temp:grid_mapping = "crs:x y" ;

If a data producer chose to include 2D latitude and longitude coordinates, and 
defined a CRS definition for these, let's call that var: `crs_wgs84` as in 
example 5.11, then the `grid_mapping` attribute would be updated to read
*     temp:grid_mapping = "crs:x y crs_wgs84:lat lon" ;

I would expect to update examples 5.11 and 5.12 as part of this change

Jim: Do you think it worthwhile including this example:
1. in the conventions?
1. as an alteration to 5.12?
1. as an abridged example, combining 5.11 and 5.12 in short form as a new 
example?

many thanks
mark


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