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#107: CF Data Model 1.7
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Reporter: markh | Owner: cf-conventi...@lists.llnl.gov
Type: task | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords:
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Comment (by markh):
Replying to [comment:35 jonblower]:
> Thanks Mark, that looks good to me. A minor semantic point that I wasn't
sure about - you say "'''Where''' the grid_mapping attribute does not
define explicit references between coordinates and a CRS..." do you mean
"While"?
>
In CF NetCDF files there are two allowable syntax approaches for the
grid_mapping attribute.
1. One syntax explicitly links a coordinate to a CRS:
* e.g. `temp:grid_mapping = "crsOSGB: x y crsWGS84: lat lon" ;`
1. The other syntax does not provide explicit links:
* e.g. `temp:grid_mapping = "crsOSGB" ;`
My aim for this sentence is to make it certain that where the `2.` syntax
is used, there is still an explicit reference, and that the X and y
coordinate variables are defined with respect to this CRS.
In other words, it provides backwards compatibility to the syntax from
older version of CF whilst maintaining the same semantics.
> I'm trying to get whether the the explicit references ''may or may not
''appear, or whether they ''never'' appear.
So, explicit references may or may not appear in a CF NetCDF file, but, if
they don't appear explicitly, they are unambiguously implicit.
--
Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/107#comment:36>
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