[CF-metadata] Proposed cell_methods method

From: mcginnis at ucar.edu <mcginnis>
Date: Fri, 29 Jun 2007 16:20:58 -0600

It looks like a case where you apply one of the transformational rules:

RULE: change_over_time_in_X

UNITS: [X]

MEANING: change in a quantity X over a time-interval, which should
be defined by the bounds of the time coordinate.

(From "Guidelines for Construction of CF Standard Names, at:
http://cf-pcmdi.llnl.gov/documents/cf-standard-names/guidelines )

So the standard name would be "change_over_time_in_air_pressure", I
think, with an associated timebnds variable as described in section 7.1.

--Seth

----
Seth McGinnis
Associate Scientist
ISSE/NCAR
----
> CF Community,
>
> In another community, a member is trying to correctly represent a 
> variable with a long name of "3 hour pressure change".  The variable 
> has units of Pa, so I believe it's standard name should be 
> "air_pressure", not "tendency_of_air_pressure".  However, the 
> variable should probably have a cell_methods attribute that indicates 
> this is a change over time, not an absolute measurement.  But how to 
> do so?
>
> Perhaps something like cell_methods="time: change (interval: 3 hour)"
>
> But there is no cell_method in appendix E like "change".
>
> The alternative is to propose a new standard name 
> "change_over_time_in_air_pressure", but doing so seems inelegant.
>
> Mike
>
> _____________________________________________
> Michael A. Godin
> Software Engineer
> Monterey Bay Aquarium Research Institute
> Phone: 831-775-2063  http://www.mbari.org
>
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Received on Fri Jun 29 2007 - 16:20:58 BST