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Reflectance
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===Spectral directional reflectance=== The ''spectral directional reflectance in frequency'' and ''spectral directional reflectance in wavelength'' of a surface, denoted {{math|''R''<sub>Ω,''ν''</sub>}} and {{math|''R''<sub>Ω,''λ''</sub>}} respectively, are defined as<ref name="ISO_9288-1989" /> <math display="block">R_{\Omega,\nu} = \frac{L_{\mathrm{e},\Omega,\nu}^\mathrm{r}}{L_{\mathrm{e},\Omega,\nu}^\mathrm{i}},</math> <math display="block">R_{\Omega,\lambda} = \frac{L_{\mathrm{e},\Omega,\lambda}^\mathrm{r}}{L_{\mathrm{e},\Omega,\lambda}^\mathrm{i}},</math> where *{{math|''L''<sub>e,Ω,''ν''</sub><sup>r</sup>}} is the [[Radiance|spectral radiance in frequency]] ''reflected'' by that surface; *{{math|''L''<sub>e,Ω,''ν''</sub><sup>i</sup>}} is the spectral radiance received by that surface; *{{math|''L''<sub>e,Ω,''λ''</sub><sup>r</sup>}} is the [[Radiance|spectral radiance in wavelength]] ''reflected'' by that surface; *{{math|''L''<sub>e,Ω,''λ''</sub><sup>i</sup>}} is the spectral radiance in wavelength received by that surface. Again, one can also define a value of {{math|''I''/''F''}} (see above) for a given wavelength.<ref>See for example {{cite journal | display-authors=etal |last1=P.G.J Irwin |title=Hazy Blue Worlds: A Holistic Aerosol Model for Uranus and Neptune, Including Dark Spots |journal=Journal of Geophysical Research: Planets | date=Jan 12, 2022 |volume=127 |issue=6 |pages=e2022JE007189 |doi=10.1029/2022JE007189 |pmid=35865671 |pmc=9286428 |arxiv=2201.04516 |bibcode=2022JGRE..12707189I |hdl=1983/65ee78f0-1d28-4017-bbd9-1b49b24700d7 |s2cid=245877540 |bibcode-access=free |doi-access=free |hdl-access=free |s2cid-access=free }}</ref>
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