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

 Dear Martin

 I'm glad you like the motivation statement. Thanks are due to Steve.

 Sect 5.7 strongly recommends against giving a scalar coordinate variable
 the same name as a dimension, as Jim advocates too. That's because it
 could be confusing: the scalar coordinate variable is a shorthand; it
 takes the places of a size-one coordinate variable, with the dimension
 omitted.

 If you wanted to exchange the roles of a coordinate variable and a 1D
 auxiliary coordinate variable which share a size-one dimension in a netCDF
 file, you would have to rename the dimension. Also, auxiliary coordinate
 variables have to be named by the `coordinates` attribute; coordinate
 variables are not normally listed there, but it is not prohibited. When I
 was writing about exchanging their roles, I was thinking more of doing
 this in software which processes, and hence could reinterpret, the CF-
 netCDF file, rather than changing the file itself.

 Is this OK?

 Best wishes

 Jonathan

-- 
Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/104#comment:27>
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