#140: Clarifying the role of attributes on boundary variables.
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Reporter: davidhassell | Owner: cf-conventions@…
Type: enhancement | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords: boundary variable, attribute
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Comment (by taylor13):
Hi David,
Thanks for getting this done so quickly.
This looks fine except:
In the examples, the half levels should apply to bounds, and the full
levels to the coordinate itself. This is I think always the case for eta
with one example provided at:
https://rda.ucar.edu/datasets/ds627.2/docs/Eta_coordinate/
In the 2nd example, wouldn't it be better to label it: "Linking variables
appearing in formula_terms associated with coordinate values with their
counterparts associated with the bounds of the coordinates."
In the 2nd example, I think we should require the units attribute be
defined for both A_bnds and B_bnds. Otherwise software relying on the now
recommended method for defining these would have to figure out the units
from the bounds attributes attached to A and B, which is more work. We
would probably also want to tweak the last sentence in the 1st paragraph
which states: "To avoid duplication, however, it is recommended that these
are not provided to a boundary variable" (since I think in the case of
bounds attached to formula term variables, I think the units should be
provided).
best regards,
Karl
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Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/140#comment:23>
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