Question-and-Answer Resource for the Building Energy Modeling Community
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Thanks for the clarifications. The simplest answer is you can sample whatever and however you wish since Jan's proposals were never to my knowledge codified into any particular standard or metric. Assuming your images have been created correctly and are producing valid DGP values first and foremost, you can as you state in your last comment make any case you want. You have DGP data for multiple seasons, but only a single point and apparently, only a single view direction from said point. This is a pretty limited "view" of the luminous environment of a space, to be honest. So I'd look at what you have from both perspectives, the one you explain here, as well as Jan's proposed. THat will be interesting in and of itself.
I'm pretty sure Jan Weinold is on this forum, perhaps he'll have additional insights. I also encourage you to look at Jakubiec and Reinhart's "Adaptive Zone" paper; assuming you can obtain additional view direction data for the DGP analysis, this would add a very realistic scalar to the metric.
