In this paper

a synthetic strategy has been employed to model 3D canopy’s radiation transfer in the whole optical spectral domains.3D plant architecture model（the Clumped Architecture Model of Plants: CLAMP） is used to generate the realistic vegetation scene.In the visible and NIR region

the canopy BRDF was decomposed into three parts: single scattering contribution from leaves

single scattering contribution from the soil

and multiple scattering part of the canopy.The single scattering contributions come from illuminated leaves and soil components which are computed by the reverse ray-tracing procedure with their corresponding reflectance.The multiple scattering contribution is approximated by the four-stream theory.As a result

the modeling of VNIR region is more efficient and fairl accurately describes the anisotropically scattering features of vegetation.Simulation results show good consistency with SAILH’s

and more details can be simulated than the one dimensional rediative transfer models.In the TIR region

the directional brightness temperature of canopy is calculated as the linear combination of four（component’s）（illuminated leaves

illuminated ground

shadowed leaves

and shadowed ground） brightness temperature multiplied by its fractional cover computed by the reverse ray-tracing procedure.Initial modeling results show typical features of（vegetation’s） anisotropic scattering and directional temperature distributions

for example

hot spot

bowl shape and reach a good agreement with theoretical results in those three domains.This strategy shows potential of exploring the impact of canopy structure on the radiometric response measured by remote sensors.