John,
But ancillary variables aren't coordinates, are they?
Jim
On 12/21/15 1:08 PM, John Caron wrote:
> i think a crucial property of coordinates is that their dimensions are
> a subset of the variable's dimensions. otherwise one cant assign the
> correct coordinate.
>
> the length of a char valued coordinate is an exception, really char(n)
> is logically the same as string.
>
> while a dim=1 coordinate could be used, it would violate that simple
> principle for no obvious gain. scalar here is preffered i think.
>
> we added some language to CF recently to clarify this. not sure where
> it is.
>
> john
>
>
>
> On Mon, Dec 21, 2015 at 8:49 AM, Jim Biard <jbiard at cicsnc.org
> <mailto:jbiard at cicsnc.org>> wrote:
>
> 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 <mailto:d.c.hassell at reading.ac.uk>
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/formerly NOAA?s National Climatic Data Center/
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Received on Mon Dec 21 2015 - 13:06:01 GMT
