Continuous bidirectional reflectance (BRF) measurement of snow using monochromatic camera

An approach of using monochromatic camera for observation of the principal plane bidirectional reflectance characteristics of snow is presented. The photos are continuously taken at nadir view with an interval of 1 min. The mean intensity of the photos is used to observe the relative dependence of the reflectance of snow on the solar zenith angle (SZA). Both the decrease of the snow bidirectional reflectance and its diurnal asymmetry with respect to the SZA during the melting season are demonstrated.