If no one can provide a reasonably knowledgeable response, proposing a new definition would (a) potentially make the most desirable clarification/modification and (b) elicit any conflicts from anyone on the CF-metadata list. One of the list minders will undoubtedly weigh in on this when they have a chance.
On Jun 27, 2012, at 07:43, Tom Whittaker wrote:
> Randy --
>
> This is a tough question, since there is a lack of detail in most of
> the "standard_name" entries that I looked at. It seems to me that
> what you want to do is to make certain that the user of the data
> understands exactly what was taken into account (and what was
> not)...which tells me this does not have to be a "machine readable"
> description. I see a few possible options:
>
> 1. create a new standard_name which clarifies these matters
> 2. modify the current one (if appropriate...?)
> 3. use either the long_name or the "comment" to provide the particulars
>
> Also, your question about who (or what programs) might be currently
> using this is probably impossible to answer -- but I would bet at
> least the person who made the entry initially and perhaps they can be
> contacted.
>
> I hope this helps get others to provide some input on this issue...
>
> tom
>
> On Tue, Jun 26, 2012 at 5:44 PM, Randy Horne <rhorne at excaliburlabs.com> wrote:
>> Folks:
>>
>> I am working the GOES-R program. We have a few very specific questions on
>> the use of a standard name (toa_bidirectional_reflectance):
>>
>> The top of atmosphere (TOA) reflectance is a key product from satellite
>> observations but is
>> often ambiguous as a result of the many non-standard definitions used
>> throughout the
>> community. The CF standard name table includes
>> "toa_bidirectional_reflectance" as a unitless
>> quantity that is the ratio of the reflected to incident energy. However, the
>> details of this
>> quantity are not completely clear.
>>
>> (1)
>> Does it include an integration of solid angle - i.e., introducing a factor
>> of PI for Lambertian surface? Does it include or exclude the cosine
>> (SZA) factor that is often omitted from imagery (and that allows a direct
>> scaling from radiance to
>> reflectance)?
>>
>> (2) What programs have already adopted the "toa_bidirectional_reflectance"
>> and how can one ensure that the convention is being used consistently with
>> respect to the above questions?
>>
>> very respectfully,
>>
>> randy
>>
>>
>>
>>
>>
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>>
>
>
>
> --
> Tom Whittaker
> University of Wisconsin-Madison
> Space Science & Engineering Center (SSEC)
> Cooperative Institute for Meteorological Satellite Studies (CIMSS)
> 1225 W. Dayton Street
> Madison, WI 53706 USA
> ph: +1 608 262 2759
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
----------------
John Graybeal <mailto:jgraybeal at ucsd.edu> phone: 858-534-2162
Product Manager
Ocean Observatories Initiative Cyberinfrastructure Project:
http://ci.oceanobservatories.org
Marine Metadata Interoperability Project:
http://marinemetadata.org
Received on Wed Jun 27 2012 - 12:52:15 BST
