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#104: Clarify the interpretation of scalar coordinate variables
-----------------------------+----------------------------------------------
  Reporter:  jonathan        |       Owner:  [email protected]
      Type:  defect          |      Status:  new                          
  Priority:  medium          |   Milestone:                               
 Component:  cf-conventions  |     Version:                               
Resolution:                  |    Keywords:                               
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Comment (by markh):

 I disagree with this proposal.

 > We do not think this is a material change to the convention, which
 already implies this interpretation, and we believe this interpretation is
 what was intended when scalar coordinate variables were introduced.

 Such an implication is really not clear in the conventions as they stand.

 The reinterpretation of existing CF compliant data implied by the 'defect'
 status of this ticket is particularly undesirable.

 I view this as a regressive proposal, limiting the utility of CF for a
 number of scenarios without good justification.  This functionality is
 providing benefit to the community and we should not remove that.

 > The interpretation of scalar coordinate variables in Section 9 may be
 different from the above, and this may require further clarification if
 the above is agreed.

 This statement highlights to me that the interpretation put forward here
 is not complete.

 I have significant reservations about having a whole range of
 interpretations of scalar coordinate variables depending on the context
 they exist in with respect to a data variable.

 This is a particularly confusing approach for data creators and I fear it
 will lead to CF compliant data sets where the intended meaning is not
 correctly encoded.

 I think there is a better way to approach this, which will deliver a
 cleaner and clearer result.

-- 
Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/104#comment:8>
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