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 <[email protected]> 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 <[email protected]> >> 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 >>> _______________________________________________ >>> CF-metadata mailing list >>> [email protected] >>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata >> >> ____________________________________ >> >> Randy C. Horne ([email protected]) >> Principal Engineer, Excalibur Laboratories Inc. >> voice & fax: (321) 952.5100 >> url: http://www.excaliburlabs.com >> >> >> >> >> >> _______________________________________________ >> CF-metadata mailing list >> [email protected] >> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ____________________________________ Randy C. Horne ([email protected]) Principal Engineer, Excalibur Laboratories Inc. voice & fax: (321) 952.5100 url: http://www.excaliburlabs.com
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