where kbl (0.84) is the extinction coefficient for a crop with spherical
leaf angle distribution, when the crop is composed of black
leaves and is the scattering coefficient.
The wavelength dependent scattering coefficient equals the
sum of reflection and transmission and was derived from the
spectrometer measurements per wavelength at the leaf level.
Consequently, Eq. (3) scales up this leaf property to crop level.
Moreover, is used to simulate the canopy reflection coefficient
c, using the expression: