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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