Coupled atmosphere/canopy model for remote sensing of plant reflectance features

摘要: Solar radiative transfer through a coupled system of atmosphere and plant canopy is modeled as multiple-scattering problem layered medium random scatterers. The equation solved by the discrete-ordinates finite-element method. Analytic expressions are derived that allow calculation scattering absorption cross sections for any layer from measurable biophysical parameters such leaf area index, angle distribution, individual reflectance transmittance data. An expression phase function also given. Computational results in good agreement with spectral measurements directly above soybean canopy, concept greenness- brightness-transforms Landsat MSS data reconfirmed our computed results. A sensitivity analysis atmosphere/canopy model quantifies how satellite-sensed radiances affected increased atmospheric aerosols, varying anisotropic scattering, non-Lambertian soil boundary conditions. Possible extensions to 2-D discussed.