Directional-hemispherical reflectance (Climatology π)
Directional-hemispherical reflectance is the reflectance of a surface under direct illumination. Directional-hemispherical reflectance is the integral of the bidirectional reflectance distribution function over all viewing directions. It is sometimes called "black-sky albedo".
https://en.wikipedia.org/wiki/Directional-hemispherical_reflectance
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