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Semi-infinite homogeneous layered media based on bi-directional reflectance function model (Mishchenko) the exact numerical solution for the Fortran language code. The homogeneous medium of arbitrary shape by the random orientation of particles. The bidirectional reflectance distribution function for soil and snow/ice. File spher.f calculated by means of Lorenz-Mie theory of the Legendre polydisperse diffusion coefficient of spherical particles. File refl.f calculate the Fourier components of reflectance functions. The calculation of any interp.f sun- under the bidirectional reflectance sensor function.