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#107: CF Data Model 1.7
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Reporter: markh | Owner: cf-conventions@…
Type: task | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords:
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Comment (by biard):
Replying to [comment:60 davidhassell]:
> Replying to [comment:59 markh]:
>
> Dear Mark, Jim,
>
> > Replying to [comment:56 biard]:
> >
> > > I get the feeling that your effort to put formula_terms and
grid_mapping together in one construct definition may be what's making
things awkward.
> >
> > I agree with you Jim, I think this is awkward.
>
> > The functionality of CF-NetCDF formula_terms and grid_mappings may be
simpler and clearer in the model if they are defined separately; they are
quite different.
>
> Ok. We should discuss this! I think that fundamentally they are the
same, which why they should not be separated in the ''logical'' data model
> ...
> All the best,
>
> David
As I read the definition and usage of formula_terms, I find that it is
'''entirely and only''' a description of how to combine the values of a
unitless coordinate variable with values from other variables to produce
coordinate values that have units. It is possible that this "resultant
coordinate" could be georeferenced, but that is something else. It is
true that it is meaningless to associate a CRS with a unitless coordinate
variable if you don't provide a description of how to get to values that
can be georeferenced, but this doesn't mean that a mathematical transform
equates on any level with a declaration of a CRS.
Grace and peace,
Jim
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Ticket URL: <http://kitt.llnl.gov/trac/ticket/107#comment:62>
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