bidirectional reflectance factor

From Glossary of Meteorology
A function describing the anisotropy of reflected radiance from a surface illuminated from a single direction.

It is equal to π times the reflected radiance divided by the incident irradiance from a single direction.
See also bidirectional reflection function, bidirectional reflectance distribution function.

A radiometric term for the rate at which radiant energy in a set of directions confined to a unit solid angle around a particular direction is transferred across unit area of a surface (real or imaginary) projected onto this direction.

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