This message came from the CF Trac system. Do not reply. Instead, enter your
comments in the CF Trac system at http://kitt.llnl.gov/trac/.
#107: CF Data Model 1.7
-----------------------------+------------------------------
Reporter: markh | Owner: cf-conventions@…
Type: task | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords:
-----------------------------+------------------------------
\
\
\
\
\
\
Comment (by jonathan):
Dear Jim and Mark
The text David and I proposed was
The cell methods construct describes the methods by which the data
values of the field construct represent variation within their cells.
and Jim proposes
The cell methods construct describes the methods by which the data
values of the field construct are derived from a source measurement field
(which may or may not be represented by an existing field construct).
With respect to the differences between these, I would comment:
1. CF doesn't only deal with measurements (which sounds like obs), so I
don't think the word "measurement" should appear.
2. I think "derived" is too general. The reason for writing "variation"
in our definition is because all of the cell methods do that, by
calculating a statistic from the variation, or by indicating it has no
relevant variation because it is a point (intensive) or a sum (extensive).
I think this needs to be indicated by the wording. "Derived" could mean
all sorts of mathematical operation which are not encompassed by
`cell_methods`.
3. I don't see the parenthesis as really necessary, and I'm not sure
it's true. The source field may never have existed. If it's a point or
sum, then probably there was no source field. This field is the data, and
`cell_methods` tells us something about what it means.
Best wishes
Jonathan
\
\
\
--
Ticket URL: <http://kitt.llnl.gov/trac/ticket/107#comment:67>
CF Metadata <http://kitt.llnl.gov/>
CF Metadata
This message came from the CF Trac system. To unsubscribe, without
unsubscribing to the regular cf-metadata list, send a message to
"[email protected]" with "unsubscribe cf-metadata" in the body of your
message.
