I'm in agreement with Jonathan!
On 5/6/15 1:09 PM, Jonathan Gregory wrote:
> Dear Kristian
>
>> In these case the feature type is a trajectory, so
>> the latitude and longitude are auxiliary coordinates.
>>
>> You said that for auxiliary coordinates it could be ok, Would this mean
>> that it could be added to the CF conventions?
> I don't think any change would be needed to the CF convention. CF allows a
> given netCDF variable to serve as both a data variable in its own right and
> an aux coord var of another data variable. An example of where this might be
> useful is for an ocean model on density levels, in which depth as a function
> of density is of interest as a data variable, but could also be an auxiliary
> coordinate variable for other data variables. Therefore I think it would be
> legal for your aux coord vars to have ancillary vars. Since the lat and lon
> along a trajectory are actually dependent data variables, this feels quite
> reasonable to me for your case. I wonder what others think.
>
> Cheers
>
> Jonathan
>
>> On 5 May 2015 at 18:58, Jonathan Gregory <j.m.gregory at reading.ac.uk> wrote:
>>
>>> Dear Kristian
>>>
>>> Ancillary variables are only for data variables in the current convention.
>>> It wouldn't be illegal to use the attribute on coord variables, but CF
>>> doesn't define what that would mean. (CF always permits any
>>> non-standardised
>>> attributes.)
>>>
>>> I wonder whether these are 1D coord variables (in the Unidata sense) or
>>> aux coord vars (named by the coordinates attribute)? In the latter case, it
>>> could be OK, because other data variables could be named as aux coord vars.
>>>
>>> Best wishes
>>>
>>> Jonathan
>>>
>>>
>>> ----- Forwarded message from Kristian Sebasti??n <ksebastian at socib.es>
>>> -----
>>>
>>>> Date: Thu, 30 Apr 2015 08:43:54 +0200
>>>> From: Kristian Sebasti??n <ksebastian at socib.es>
>>>> To: cf-metadata at cgd.ucar.edu
>>>> Subject: [CF-metadata] Ancillary variables in coordinate variables
>>> (latitude,
>>>> longitude, ...)
>>>>
>>>> Dear CF community,
>>>>
>>>> We have some dataset with quality controls applied to the coordinate
>>>> variables, such as latitude and longitude coordinate. The result are
>>>> quality control variables that we associate as ancillary variables of the
>>>> coordinate variables with the ancillary_variables attribute. For example,
>>>> the LAT coordinate variable has the ancillary variable QC_LAT. The
>>> dataset
>>> http://thredds.socib.es/thredds/dodsC/drifter/surface_drifter/drifter_svp052-ime_svp017/L1/2014/dep0001_drifter-svp052_ime-svp017_L1_2014-05-25.nc
>>>> The cf-conventions clarifies the use of the ancillary_variables attribute
>>>> for data variables but not for coordinate variables. My question is, Is
>>> the
>>>> ancillary_variables attribute in coordinates variables compliant with the
>>>> cf-conventions?
>>>>
>>>> Best regards,
>>>>
>>>> Kristian
>>>>
>>>> --
>>>>
>>>> Kristian Sebastian Blalid
>>>> SOS Division: Data Center Technical
>>>> Tel: 971439860 - Fax: 971439979
>>>> E-mail: kristian.sebastian at socib.es
>>>
>>>
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>>>
>>> ----- End forwarded message -----
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>>>
>>
>>
>> --
>>
>> Kristian Sebastian Blalid
>> SOS Division: Data Center Technical
>> Tel: 971439860 - Fax: 971439979
>> E-mail: kristian.sebastian at socib.es
>
>
> ----- End forwarded message -----
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Received on Wed May 06 2015 - 12:08:24 BST
