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IEVref:845-25-089ID:
Language:enStatus: Standard
Term: bi-directional reflectance distribution function
Synonym1: BRDF
Synonym2:
Synonym3:
Symbol: ρ(θi,ϕi,θr,ϕr,xr,yr,λ)
Definition: function describing the change with direction of irradiation (θi,ϕi) and direction of view (θr,ϕr) of the radiance of a surface element (xr,yr) in a given direction of view at a given wavelength λ, Lr(θr,ϕr,xr,yr,λ), with respect to the irradiance incident on the medium from the given direction of irradiation at the given wavelength, Ei(θi,ϕi,λ)

ρ(θi,ϕi,θr,ϕr,xr,yr,λ)=dLr(θr,ϕr,xr,yr,λ)dEi(θi,ϕi,λ)

Note 1 to entry: The bi-directional reflectance distribution function is expressed in steradian to the power minus one (sr−1).

Note 2 to entry: See also "radiance coefficient".

Note 3 to entry: This note applies to the French language only.


Publication date:2020-12
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