An improved model of surface BRDF-atmospheric coupled radiation

Based on the 6S code, an improved model of the surface BRDF-atmospheric coupled radiation is proposed, in which the key point is an upward flux correction. As shown in comparative numerical simulations, this model generally has a better accuracy than some exiting models. In the condition of the solar zenith angle /spl theta//sub s//spl les/75/spl deg/ and the viewing angle /spl theta//sub v//spl les/60/spl deg/, the error by the present model is usually smaller than 2.5%.