Three-dimensional forest light interaction model using a Monte Carlo method
Three-dimensional forest light interaction model using a Monte Carlo method
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DOI：
10.1109/36.508411
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
P. North
中科院分区：
文献类型：
--
作者：
P. North
基于光子输运的Monte Carlo模拟，提出了一个光与森林冠层相互作用的模型。一个混合表示是用来模拟森林冠层的不连续性。大尺度结构由定义树冠和树干的形状和位置的几何图元表示。树叶表示内冠的体积平均参数描述的散射元素的结构和光学特性。三维光子轨迹的模拟允许冠内，不同的冠，树干和地面之间的多重散射的准确评估。天空辐射场被视为各向异性的，从双向反射计算解耦。验证已进行了一个例子，茂密的云杉林。结果表明，模型预测和现场测量的双向反射率，高分辨率光谱和半球形反射率之间的密切协议。
A model for light interaction with forest canopies is presented, based on Monte Carlo simulation of photon transport. A hybrid representation is used to model the discontinuous nature of the forest canopy. Large scale structure is represented by geometric primitives defining shapes and positions of the tree crowns and trunks. Foliage is represented within crowns by volume-averaged parameters describing the structural and optical properties of the scattering elements. Simulation of three-dimensional photon trajectories allows accurate evaluation of multiple scattering within crowns, and between distinct crowns, trunks and the ground surface. The sky radiance field is treated as anisotropic and decoupled from bidirectional reflectance calculation. Validation has been performed on an example of dense spruce forest. Results show close agreement between model predictions and field measurements of bidirectional reflectance, high-resolution spectra and hemispherical albedo.