Jonathan:
We are planning on using flags with numeric values as you suggest Your input is helpful in that is is deemed unnecessary to specifically identify values in the definition as is the case with the binary_masks, This provides additional flexibility to data producers.
Revising the proposal per your recommendation ?
standard_name: cloud_phase_category
definition:
A numeric value indicating one of the following categories: clear; liquid water; super-cooled liquid water; mixed phase; ice, and; unknown.
very respectfully,
randy
On Apr 19, 2013, at 5:59 AM, Jonathan Gregory wrote:
> Dear Randy
>
> There is another way to do it, which makes the files more self-describing and
> has been suggested for other similar situations. You could instead define the
> standard_name for a new string-valued quantity such as cloud_phase_category,
> but store the data in the file in numeric form using flag_values and
> flag_meanings. Then you don't have to standardise the actual numbers used.
> I suppose that the permitted strings should be part of the definition of the
> standard name (instead of defined numerical values).
>
> Best wishes
>
> Jonathan
>
> ----- Forwarded message from "rhorne at excaliburlabs.com" <rhorne at excaliburlabs.com> -----
>
>> From: "rhorne at excaliburlabs.com" <rhorne at excaliburlabs.com>
>> To: cf-metadata at cgd.ucar.edu
>> Date: Thu, 18 Apr 2013 18:05:09 -0400
>> Subject: [CF-metadata] new standard_name needed for cloud_phase (an
>> enumeration type)
>>
>>
>>
>> Folks: The GOES-R ground system is generating a cloud phase quantity.
>> This is derived from the imager aboard the geostationary satellite. The
>> quantity can take on six value (i.e. it is an categorical / enumeration
>> type) where each value defines a different cloud phase category - Clear(0),
>> liquid water(1), super-cooled liquid water(2), mixed phase(3), ice(4),
>> unknown(5). I looked through the current CF standard_name table and
>> could not find any enumeration types other than the binary_masks. Here
>> is a first cut at a proposal that generally follows the existing
>> binary_mask standard_names: standard_name: cloud_phase_category
>> definition: X_category has six categories where 0=clear, 1=liquid water,
>> 2=super-cooled liquid water, 3=mixed phase, 4=ice, and 5=unknown. very
>> respectfully, randy
>
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>
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____________________________________
Randy C. Horne (rhorne at excaliburlabs.com)
Principal Engineer, Excalibur Laboratories Inc.
voice & fax: (321) 952.5100
url:
http://www.excaliburlabs.com
Received on Fri Apr 19 2013 - 05:38:40 BST
