Airlight formula

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airlight formula

(Also called Koschmieder's law.) A version of the radiative transfer equation that predicts the luminance due to airlight (La) in the direction of a perfectly black object near the horizon.

La can be used to calculate daytime visual range. For horizon sky luminance Lh, horizontally uniform extinction coefficient σ, and distance x from the observer:
ams2001glos-Ae14

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