Hi Karl:
In the application I am working, the notion of these values being distributions is secondary. Some of our products do not include all three of these (i.e. day, night, twilight). For example we have a gridded data product that has valid data only for the area within the product?s region that is daytime.
very respectfully,
randy
On Jan 3, 2014, at 4:07 PM, Karl Taylor <taylor13 at llnl.gov> wrote:
> Hi all,
>
> I don't find "area_fraction_of_solar_zenith_angle" to be understandable and I'm not sure the phrase makes sense. I don't see how you can have an "area of a solar zenith angle" (or an area_fraction of an angle). One could also be misled into thinking this was somehow related to the solid angle associated with a cone defined by the zenith angle.
>
> Perhaps some other variant on the earlier suggestions would be better. (either 3 names, or something related to "distributions" ... afterall the quantity is calculated by considering the normalized histogram of pixels (of equal area) placed in 3 different bins: day, night, and "twilight").
>
> best regards,
> Karl
>
> On 1/3/14 12:33 PM, Randy Horne wrote:
>> Dear Jonathan:
>>
>> RE:
>>> The first sentence is not clear to me. Does it mean, "The fraction of the
>>> horizontal area where the solar zenith angle is within a specified range"?
>>
>> Yes, that is what it means.
>>
>> Incorporating this more clear statement yields the following:
>>
>> area_fraction_of_solar_zenith_angle
>>
>> definition:
>> The fraction of the horizontal area where the solar zenith angle is within a specified range. A coordinate variable of solar_zenith_angle with boundaries indicating the range must be specified.
>>
>> very respectfully,
>>
>> randy
>>
>>
>> On Jan 3, 2014, at 2:53 PM, Jonathan Gregory <j.m.gregory at reading.ac.uk> wrote:
>>
>>> Dear Randy
>>>
>>>> a single standard name of area_fraction_of_solar_zenith_angle is fine. This form could be useful for area fractions of other angles, such as platform zenith angle.
>>> Yes, true. If you're happy with it, then fine.
>>>
>>>> As far as a definition goes, how about:
>>>> fraction of horizontal area resulting from the projection of the solar zenith angle. A
>>>> coordinate variable of solar_zenith_angle with boundaries indicating the
>>>> angular extent must be specified.
>>> The first sentence is not clear to me. Does it mean, "The fraction of the
>>> horizontal area where the solar zenith angle is within a specified range"?
>>>
>>> An advantage of this more general quantity is that you could contain day,
>>> night, twilight and any other such fraction in a single data variable, if
>>> you wanted to, by having a dimension of size more than one for the solar
>>> zenith angle.
>>>
>>> Best wishes
>>>
>>> Jonathan
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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
>>
>>
>>
>>
>>
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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
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