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Derived quantities




Bidirectional reflectance
= r = I/πF

phys.bidir?

phys.reflectance.bidirectional.df
- accepted in Feb 2018, weird

sr**(-1)

Ratio of radiance to incident normal solar flux


bidirectional reflectance distribution function
(BRDF) = r / µ0


phys.brdf?- OK in

phys.reflectance.bidirectional.df
- accepted in Feb 2018

sr**(-1)

(mostly used in terrestrial remote sensing)

Reflectance factor (REFF) =
Radiance coefficient πr/µ0

phys.reff?

phys.reflectance.factor
- accepted  in Feb 2018

dimensionless

Ratio of radiance to that of a Lambertian disk at the same distance and illuminated under the same incidence
(used with laboratory samples)

Normalized reflectance

arith.ratio;phys.reflectance
? no: artiharith.ratio is S

M4ast currently uses (better, std)
phys.reflectance;em.wl;arith.ratio

would do: 
phys.reflectance;arith.ratio

dimensionless

Normalized to 1 at some wavelength

+ thermal / emission quantities

phys.emissivity

Same as I/F for spectral measurements


I/F also apply to observations in the thermal range. What about lab measurements?
+ Apparent emissivity, etc…

+ Hemispherical quantities

 Integrated in half space


TBC

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