Dear Jonathan:
Your recommendation of changing the cell method name from the
standard_name to "area" is analogous to the recommendation you provided me
at the start of this message thread.
In para 7.3.4 (Cell methods when there are no coordinates). the first
sentence is:
"To provide an indication that a particular cell method is relevant to the
data without having to provide a precise description of the corresponding
cell, the "name" that appears in a "name: method" pair may be an
appropriate standard_name (which identifies the dimension) or the string,
"area" (rather than the name of a scalar coordinate variable or a dimension
with a coordinate variable)."
Can you explain when standard_name serving as the name (rather than
"area") is appropriate ?
very respectfully,
randy
----------------------------------------
From: "Jonathan Gregory" <j.m.gregory at reading.ac.uk>
Sent: Wednesday, March 05, 2014 4:41 AM
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] can a cell method be an attribute of an auxiliary
coordinate variable ?
Dear Jim
> We are attempting to follow section 9. The centroid of the weather system
is calculated at each time step, and we are planning to use the longitude
and latitude calculated as the coordinates of the system. So, for example,
would the variables below be OK? (I?ve left out time and numerous other
variables.)
>
> float lat(trajectory, obs)
> :standard_name = ?latitude?
> :axis = ?Y?
> :cell_methods = ?latitude:mean (over system)?
>
> float lon(trajectory, obs)
> :standard_name = ?longitude?
> :axis = ?X?
> :cell_methods = ?longitude:mean (over system)?
>
> float maxlat(trajectory, obs)
> :cell_methods = ?latitude:maximum (over system)"
>
> float mtpwv(trajectory, obs)
> :long_name = ?mean total precipitable water vapor?
> :cell_methods = ?area:mean (over system)?
I think the approach is OK but I would suggest for latitude and longitude
"area: mean (over system)" and for maxlat "area: maximum (over system)".
These
indicate statistics of lat and lon which are calculated from the variation
over
the area of the system. Is that what you intend? The cell_methods is a
blank-
separated list of words, so there's a space after ":".
Cheers
Jonathan
_______________________________________________
CF-metadata mailing list
CF-metadata at cgd.ucar.edu
http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20140305/94054406/attachment.html>
Received on Wed Mar 05 2014 - 05:57:00 GMT
