Bi-hemispherical reflectance is the reflectance of a surface under diffuse illumination (with no direct component). Bi-hemispherical reflectance is an important part of the Bidirectional reflectance distribution function over all viewing and illumination directions of a hemisphere.  It is sometimes called "white-sky albedo".
- Nicodemus, F.E.; J.C. Richmond and J.J. Hsia (October 1977). "Geometrical Considerations and Nomenclature for Reflectance" (PDF). NATIONAL BUREAU OF STANDARDS. Retrieved 8 April 2013.
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