17-1013

radiance coefficient (at a surface element of a medium, in a given direction, under specified conditions of irradiation) [qe]

quotient of the radiance of the surface element in the given direction by the irradiance on the medium

Unit: sr-1

NOTE The bi-directional reflectance distribution function (BRDF) is similar to the above coefficient except that it is defined for directional incident radiation.

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