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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 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
CF-netCDF grid_mapping and formula_terms both provide information that
indicate the location of the data, hence they can be described by the same
construct.
> Could we limit our scope in this case to the definition of frames of
reference which coordinates may be defined with respect to? I feel it
would be clearer and easier for others to use this way.
Apologies, I'm not sure what you mean, here.
> I think ''coordinate reference system'' is a commonly used term for this
in other communities which may aid communication, but if ''georeference''
is a preferred label, then I think it is usable.
One reason that we didn't use the phrase "coordinate reference system
(CRS)" is because it means different things to different people - it is
not a well defined term across all communities. I'm glad that you find
"georeference" ok.
Another is that a georeference construct is not, according to some
definitions (such as ISO 19123, Geographic information -Schema for
coverage geometry and functions) a CRS. (An ISO 19123 CRS is actually
defined by a subset of the information contained in a georeference
construct taken with the coordinate constructs to which it relates.)
All the best,
David
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Ticket URL: <http://kitt.llnl.gov/trac/ticket/107#comment:60>
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