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#107: CF Data Model 1.7
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  Reporter:  markh           |       Owner:  [email protected]
      Type:  task            |      Status:  new                          
  Priority:  medium          |   Milestone:                               
 Component:  cf-conventions  |     Version:                               
Resolution:                  |    Keywords:                               
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Comment (by jonblower):

 Dear Jonathan,

 David and I are discussing this off-line and will probably post back
 later. It's possible that we have different views of what a CRS actually
 is...

 By the way, the relationship between dimensional and dimensionless
 vertical coordinates ''does'' involve a CRS, in fact it involves two! One
 for the dimensional coordinates (e.g. "depth in metres below sea level")
 and one for the dimensionless ones (e.g. a particular sigma coordinate
 system).

 As an aside, the phrase "depth in metres below sea level" pretty much
 completely defines a (vertical) CRS. Horizontal CRSs are more complicated,
 hence all the varieties and parameters. There may be no single
 identifiable object in CF that looks like a CRS in all cases (sometimes
 the information is split between the coordinate variable and some other
 variable, sometimes the information is implicit) but logically it is there
 all the same.

 Happy to involve you in the offline discussions if you have time!

 Cheers,
 Jon

-- 
Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/107#comment:40>
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