Dear Paul,
I'm not sure you can use a numeral in front of a unit. Also "yr" must
be used with caution since the length of a calendar year is not constant
(e.g., leap years). There is a discussion of this in section 4.4 of
the standard.
The only accepted standard names can be found on the CF website. I'm
not sure "linear", "change" and "1960-2008" are part of any standard
names. I would use "longname" to store a description like the one you
tried to put in standard_name (but I'd remove the underscores).
I hope someone else can expand on how trends should be stored in CF.
best regards,
Karl
On 7/8/10 9:44 PM, [email protected] wrote:
Hi there folks..
I'm trying to generate a file containing linear trends over specified periods
(nominally 1960-2008) which are scaled to represent a linear trend for 50 years.
A first crack at this file, and a corresponding header dump can be found at:
http://*www.*marine.csiro.au/~dur041/100709_LinearChange.txt
I'm a little confused how best to represent this, as I'm uncertain how to
correctly create a simple climatology (mean values over a specified period) and
the associated time dimension/attribute, let alone their perturbation fields,
honouring the CF-1.4 conventions.
I have generated such a file and run this against the CF-1.4 compliance
checker, and aside from some general errors regarding syntax of standard_name
attributes, have hit some troubles with units etc.. In particular, the changes
represent units: degree_C/50Yrs, however this is not a valid unit in CF-1.4:
------------------
Checking variable: thetao_change
------------------
ERROR (3.3): Invalid syntax for 'standard_name' attribute:
'linear_potential_temperature_change_1960-2008'
ERROR (3.1): Invalid units: degree_C/50Yrs
The standard_name attributes indicate a simple syntax issue (I'm using a "-"
value to represent the time period over which the linear trend is calculated):
------------------
Checking variable: soi
------------------
ERROR (3.3): Invalid syntax for 'standard_name' attribute:
'southern_oscillation_index_regression_1960-2008'
I wonder if there is another variable attribute that I should set which expresses the
years over which the regression was undertaken, and remove the "1960-2008" from
the standard_name.
I'd appreciate some pointers how to best create this file, best conforming with
CF-1.4.
Cheers,
Paul
*************************************
Paul J. Durack
PhD Candidate (CSIRO/UTas - QMS)
CSIRO Marine and Atmospheric Research
GPO Box 1538
Hobart TAS 7001
Telephone: +61 (3) 6232 5283
Mobile: +61 (0) 408840428
Email: [email protected]
Web: http://*www.*cmar.csiro.au/
*************************************
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