J.K. Shultis and R.B. Myneni, "Radiative Transfer in Vegetation Canopies With Anisotropic Scattering," J. Quantum Spectroscopy and Radiative Transfer, 39, 115-129 (1988).

Abstract

The governing equation and various leaf models for photon transport in vegetation canopies that scatter anisotropically are presented. For idealized leaf-angle distributions and for simple canopy scattering models, the general transport equation and its azimuthal average are shown to reduce to standard forms encountered in radiative transfer and particle transport problems. In general, however, standard transport descriptions are not directly applicable to canopy problems. A realistic anisotropic and non-rotationally invariant scattering transfer function is examined and exact scattering models are derived. A variant of the discrete-ordinates method is then proposed for solving the canopy transport equation numerically. Finally, numerical results for a variety of agricultural canopies are compared with various theoretical and measured results.

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