Dear Daley
This kind of construction is actually not possible at the moment in cell
methods using "within" and "over". These are allowed only for times within
the climatological day and climatological year, not for arbitrary intervals
like two days. However coincidentally there is an existing proposal to extend
the convention in a way which may meet your need. Please could you look at
http://cf-trac.llnl.gov/trac/ticket/82 and see if it would? If so you could
add your support there (you need a trac userid for that) or comment if not.
Best wishes
Jonathan
----- Forwarded message from "Calvert, Daley"
<daley.calv...@metoffice.gov.uk-----
Date: Tue, 5 May 2015 16:55:13 +0000
From: "Calvert, Daley" <daley.calv...@metoffice.gov.uk>
To: "'cf-metadata@cgd.ucar.edu'" <cf-metadata@cgd.ucar.edu>
Subject: [CF-metadata] Use of "interval" in cell_methods to imply bounds of
prior operations
Hi all,
I had sent this previously, but I was not registered to the mailing list at the
time and I fear it may still be awaiting moderator approval.
Apologies if this was in fact answered!
Thanks,
Daley
From: Calvert, Daley
Sent: 31 March 2015 16:27
To: 'cf-metadata@cgd.ucar.edu'
Subject: Use of "interval" in cell_methods to imply bounds of prior operations
Hi all,
I am attempting to improve the compliance of output from an ocean model I/O
server with the CF standard. In particular I am looking to improve the
representation of time operations performed by the server, which can be applied
up to two consecutive times for statistics such as "5-day mean daily maximum"
and such forth.
I would like to represent the cell_methods as generically as possible, listing
the consecutive time operations and the frequency relating to the first time
operation. For example, a 10-day mean of 2-day maxima might be written as:
cell_methods = "time: maximum over days (interval: <timestep size>) time: mean
over days (interval: 2 days)
However I can't tell whether it is correct to use the interval comment to imply
that the maximum has been calculated every two days prior to the 10 day mean.
Any advice on this would be very welcome!
Thanks,
Daley
Daley Calvert Ocean Scientist
Met Office Hadley Centre Fitzroy Road Exeter Devon EX1 3PB United Kingdom
Tel: +44 (0)1392 885742
Email: daley.calv...@metoffice.gov.uk<mailto:daley.calv...@metoffice.gov.uk>
Website: www.metoffice.gov.uk
See our guide to climate change at
http://www.metoffice.gov.uk/climate-change/guide/
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