Bidirectional reflectance factor

From Glossary of Meteorology

bidirectional reflectance factor

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.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.