Hi Steve & Nan,
Is this allowed in CF? Isn't ancillary_variable meant to be used for
per value metadata i.e. metadata for each and every value in the
variable it is referring to? If so, shouldn't the ancillary_variable
have the same set of dimensions and in the same order as the variable it
is referring to?
Upendra
On 8/4/2011 2:17 PM, Nan Galbraith wrote:
> Hi Steve -
>
> I'm very interested in the background discussion on this -
> any chance of bringing it into the foreground?
>
> I'm using ancillary variables in 2-D in situ data files to describe
> instruments and things like precision, accuracy, sample scheme,
> etc.. For temperature files from moorings where different sensor
> types are at different depths, I'd like to use something like
>
> TEMP:ancillary_variables = "Instrument_manufacturer Instrument_model
> Instrument_sample_scheme Instrument_serial_number
> TEMP_qc_procedure
> TEMP_accuracy TEMP_precision TEMP_resolution";
> and then
> short INST_SN(depth) ;
> INST_SN:long_name = "instrument_serial_number" ;
> ... etc., etc.
>
> If there's going to be a standard way to do this, I'd really like to
> know about it - sooner rather than than later.
>
> Thanks -
> Nan
>
> On 8/4/11 11:35 AM, Steve Hankin wrote:
>> Hi Jeff,
>>
>> Each variable in a CF file may possess an |ancillary_variables|
>> attribute, that points to variables that have relationships
>> (http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.5/cf-conventions.html#ancillary-data).
>> To attach flags to a variable, use |ancillary_variables| to point to
>> a variable that has |flag_values||| and |flag_meanings |attributes
>> (http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.5/cf-conventions.html#flags).
>>
>> We have started a discussion in the background, whether an example
>> that illustrates this should be included in the CF documentation.
>>
>> - Steve
>>
>> =====================================================
>>
>> On 7/14/2010 6:21 AM, Jeff deLaBeaujardiere wrote:
>>> In another discussion, Steve Hankin wrote:
>>> > CF generally favors attributes attached to variables over
>>> attributes attached to files
>>>
>>> This reminds me of a question I wanted to ask: does CF have any
>>> conventions regarding how to handle data that contains multiple
>>> observed quantities with different quality flags, comment fields or
>>> other attributes for each quantity?
>>>
>>> -Jeff DLB
>>>
>>>
>>>
>>> _______________________________________________
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>>> CF-metadata at cgd.ucar.edu
>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
>>
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>
>
> --
> *******************************************************
> * Nan Galbraith (508) 289-2444 *
> * Upper Ocean Processes Group Mail Stop 29 *
> * Woods Hole Oceanographic Institution *
> * Woods Hole, MA 02543 *
> *******************************************************
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>
>
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Received on Thu Aug 04 2011 - 14:30:49 BST
