> @davidhassell I think there is some level on which the checker needs to get 
> involved. It needs to check consistency in the **`grid_mapping`** attribute 
> string - verifying that the CRS (grid mapping) variables exist and the 
> variable names associated with each CRS variable exist and have matching 
> dimensionality. The checker could even verify that the variables associated 
> with a given CRS represent a proper set using standard names and/or units. 
> None of this would require parsing the WKT string.

I agree with the principle here @JimBiardCics 

Myself, I'd put less onus on the checker, as long as the variables exist, I'd 
let this pass.  I expect this to be the limit of the current conformance 
expectations.

Checking for matching dimensionality, standard name, units and so on feels to 
me (at first glance) like adding complication to the checker that is difficult 
to encode to meet all cases.  A balance between good protection and minimal 
false alerts may be difficult to strike in these cases, I fear.

As always, 'What is proportionate?' is a useful detail aspect for us to reach 
consensus on within this ticket and I welcome this aspect of the discussion.

cheers
mark


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