Testing directional properties of a forest reflectance model

A multiangular and multispectral forest reflectance model is tested using B oreal Ecosystem-Atmosphere Study (BOREAS) data. A series of simulations hav e been carried out for three boreal forest stands from the BOREAS Southern Study Area in Canada, The results of simulation are compared to the PARABOL A and POLDER data on these stands, The comparisons have confirmed the abili ty of the new model to adequately simulate angular distribution. However, t here seems to be a systematic overestimation of the near- and middle-infrar ed reflectance by the model in conifer stands when the leaf biophysical/bio chemical parameters are either measured or determined by the inversion of t he measured needle reflectance and transmittance spectra.