David,
I've not come across this particular case, but I've had cases where the
ancillary data that I wish to store has less dimensions than the
corresponding parent field. The Conventions seem to require that the
dimensions all match. I'm of the opinion that it should not be so
restrictive.
In your particular instance, what is the significance of your time variable?
Grace and peace,
Jim
On 12/21/15 10:41 AM, David Hassell wrote:
> Hello,
>
> I was wondering if anyone has ever had use for an ancillary variable
> (or data variable pointed to from a formula_terms attribute), having a
> size 1 dimension which the "parent" field does *not* have. The
> convention do not say anything about this.
>
> For example:
>
> dimensions:
> t = 1;
> x = 96;
> y = 73;
>
> variables:
> float q(x, y) ;
> q:standard_name = "specific_humidity" ;
> q:units = "g/g" ;
> q:ancillary_variables = "q_error_limit" ;
>
> float q_error_limit(t, x, y)
> q_error_limit:standard_name = "specific_humidity standard_error" ;
> q_error_limit:units = "g/g" ;
>
>
> Similary for a scalar coordinate variable, which is logically
> equivalent to the size 1 dimension case (this time shown on a formula
> terms variable):
>
> dimensions:
> x = 96;
> y = 73;
> z = 19;
>
> variables:
> float q(z, x, y) ;
> q:standard_name = "specific_humidity" ;
> q:units = "g/g" ;
>
> float z(z):
> z:standard_name = "atmosphere_hybrid_height_coordinate";
> z.formula_terms = "a: var1 b: var2 orog: var3"
>
> float var3(x, y):
> time:coordinates = "time";
>
> float time:
> time:standard_name = "time";
> time:units = "days since 2000-12-1";
>
>
> Thanks for your help,
>
> All the best,
>
> David
>
>
> --
> David Hassell
> National Centre for Atmospheric Science (NCAS)
> Department of Meteorology, University of Reading,
> Earley Gate, PO Box 243,
> Reading RG6 6BB, U.K.
>
> Tel : +44 118 3785613
> E-mail: d.c.hassell at reading.ac.uk
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Received on Mon Dec 21 2015 - 08:49:58 GMT
