Estimation of the parameter error propagation in inversion based BRDF observations at single sun position

In multiangular remote sensing observations, the variable range of the sola r zenith angle (SZN) is narrow. We takes the linear kernel-driven model as an example to analyze the parameter error propagation in inversion by using the observations at single sun position and to show that in such case it i s unreliable to invert the BRDF tendency with SZN. To improve the algorithm , we suggest adding certain constraint for the changing trend of albedo wit h SZN in the model inversion.