The range of values in this page for imperceptible, perceptible, disturbing and intolerable glare make sense to me. My question is, however, are these ranges still applicable when you shift to an external environment? When the sun is out, the external environment is much brighter in comparison. And so I am getting DGP values closer to 0.7 or 0.8, which probably does not make sense because now everything is classified as glare. So, what metric would I use to figure out if, for example, a glass tower is actually creating glare for the people on the street? Should I be looking at the contrast among the luminance values in the scene? Or maybe just sunrays reflected directly by the building onto a specific spot?
“Be aware, that DGP is just a measure for discomfort glare INSIDE a building. It does not include disability glare and is also no measure for discomfort glare OUTSIDE a building, where you have much higher adaptation levels.”
I would say a ray-tracing analysis can give you a good idea of potential issues but then how to calculate DGP values based on an image analysis is something that I can’t really comment on.
I have used their researches and results for the outdoor annual glare analysis.
You can use raytracing method and equations in that paper to calculate retinal irradiance, by which to determine the potential eye damage (Fig. 2 in the paper).
I came across this theme.
Reading that you have done this type of analysis
I want to ask you, what kind of discomfort range did you use in the final result, since is not possible to use the standard DGP comfort range, for a outdoor potential glare.
