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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Thermal infrared radiative transfer within three-dimensional vegetation covers - art. no. 4248
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Thermal infrared radiative transfer within three-dimensional vegetation covers - art. no. 4248

机译：三维植被中的热红外辐射传递-艺术。没有。 4248

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摘要

The angular distribution of thermal infrared (TIR) radiation emitted by vegetation covers can vary widely depending on environmental conditions and canopy structure. As an aid in the interpretation of TIR remotely sensed data from vegetated surface with incomplete canopies, we developed a three-dimensional radiative transfer model in the thermal infrared domain. The model simulates the TIR radiative budget and upward spectral radiance of vegetation covers. The model is an extension to the TIR region of the DART (Discrete Anisotropic Radiative Transfer) model developed for the short wave domain. Radiative transfer simulation relies on discrete 3-D scene representations, which include any distribution of trees and ground covers, possibly with topography. Propagation of emitted and scattered radiation is tracked with a ray-tracing approach and the discrete ordinate method. The model was successfully tested against a physically based model for homogeneous canopies, and a partial validation was carried out with directional TIR measurements on a cotton row crop. Model simulations are presented to illustrate the influence of the canopy geometric structure on the directional apparent temperature of hypothetical vegetation covers. [References: 51]
机译：植被覆盖物发出的热红外（TIR）辐射的角度分布会根据环境条件和树冠结构而变化很大。为了帮助解释具有不完全冠层的植被表面的TIR遥感数据，我们开发了热红外域中的三维辐射传输模型。该模型模拟了TIR辐射预算和植被覆盖的向上光谱辐射。该模型是针对短波域开发的DART（离散各向异性辐射传输）模型的TIR区域的扩展。辐射传递模拟依赖于离散的3D场景表示，其中包括树木和地面覆盖物的任何分布，可能具有地形。使用射线跟踪方法和离散纵坐标方法跟踪发射和散射辐射的传播。该模型已针对基于物理模型的同质树冠成功进行了测试，并使用定向TIR测量对棉田作物进行了部分验证。提出了模型模拟，以说明冠层几何结构对假设植被覆盖的定向表观温度的影响。 [参考：51]

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