About the optimum view zenith angle for estimating sensible heat flux from surface temperature

Data experiment of Mont-Carlo directional radiation transfer model for continuous vegetation was made to decide the optimum view angle of thermal temperature for reliable estimation of sensible heat flux. The true heat fluxes were simulated with classical two-layer model. The conclusions of this study are: 1) the optimum view angle varies within a large range according to the change of leaf area index, leaf angle distribution, soil moisture and other parameters, so it´s difficult to define a universal optimum angle; 2) however, the fractional coverage of vegetation in FOV (field of view) under optimum angle is relatively stable and could be used in a new corrective method.