Bidirectional reflection function
From Glossary of Meteorology
bidirectional reflection function
(Abbreviated BDRF.) The relative angular dependence of the reflected radiance from a given region as function of both incident and viewing directions.
It is equal to π times the reflected radiance divided by the reflected irradiance.
See also bidirectional reflectance factor, bidirectional reflectance distribution function.
See also bidirectional reflectance factor, bidirectional reflectance distribution function.