REFLECTANCE SIGNATURE ON SUNLIT CROWN OF CONIFERS

Based on the field measurements of the reflected radiation distributio n an sunlit crown surface and crown structure, the analytical approxim ation model of path-scattering of light in a homogeneous layer is appl ied to the calculation of the reflectance signature of sunlit crown. T he reflectance on the sunlit crown surface is considered as the weight ed sum of the direct-to-hemisphere reflectance and the hemisphere-to-h emisphere reflectance. The validation results show that the calculated reflectance signature fits the field measurement very well. This pape r presents details of the validation and the feasibility of the model application to nonuniform medium, such as tree crown canopies.