Write an expression for the VNIR/SWIR Diffuse at sensor (i.e…

Write an expression for the VNIR/SWIR Diffuse at sensor (i.e., pupil) radiance Lp(lambda) for nadir viewing.  You do not have to expand transmission in terms of absorption or path radiance in terms of the integro-differential expansion.  You do have to consider and write out a directional (i.e., not Lambertian E_d = L_d \pi) sky, however.