RADIATIVE-TRANSFER IN 3-DIMENSIONAL ATMOSPHERE VEGETATION MEDIA

The problem of radiation transfer in three-dimensional atmosphere-vege tation media is formulated in this paper. The atmosphere is treated as a horizontally homogeneous medium but with spatially varying anisotro pic lower boundary. The boundary condition is defined in terms of vege tation canopy bidirectional reflectance factors to be evaluated from a numerical solution of the three-dimensional canopy radiative transfer equation. Numerical results obtained with the discrete ordinates meth od are in good agreement with the Monte Carlo results of Pearce and fi eld soybean reflectance data of Ranson et al.