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A Computer Simulation Model to Compute the Radiation Transfer of Mountainous Regions

机译：计算山区辐射传递的计算机仿真模型

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摘要

In mountainous regions, the radiometric signal recorded at the sensor depends on a number of factors such as sun angle, atmospheric conditions, surface cover type, and topography. In this paper, a computer simulation model of radiation transfer is designed and evaluated. This model implements the Monte Carlo ray-tracing techniques and is specifically dedicated to the study of light propagation in mountainous regions. The radiative processes between sun light and the objects within the mountainous region are realized by using forward Monte Carlo ray-tracing methods. The performance of the model is evaluated through detailed comparisons with the well-established 3D computer simulation model: RGM (Radiosity-Graphics combined Model) based on the same scenes and identical spectral parameters, which shows good agreements between these two models' results. By using the newly developed computer model, series of typical mountainous scenes are generated to analyze the physical mechanism of mountainous radiation transfer. The results show that the effects of the adjacent slopes are important for deep valleys and they particularly affect shadowed pixels, and the topographic effect needs to be considered in mountainous terrain before accurate inferences from remotely sensed data can be made.
机译：在山区，传感器处记录的辐射信号取决于许多因素，例如太阳角度，大气条件，表面覆盖类型和地形。本文设计并评估了辐射传输的计算机仿真模型。该模型采用了蒙特卡洛射线追踪技术，专门用于研究山区的光传播。通过使用正向蒙特卡洛射线追踪方法，可以实现太阳光与山区内物体之间的辐射过程。通过与公认的3D计算机仿真模型RGM（辐射度图形组合模型）进行详细比较，评估模型的性能，该模型基于相同的场景和相同的光谱参数，表明这两个模型的结果之间具有良好的一致性。通过使用最新开发的计算机模型，生成了一系列典型的山区场景，以分析山区辐射传输的物理机制。结果表明，相邻坡度的影响对于深谷很重要，并且特别影响阴影像素，并且在可以从遥感数据进行准确推断之前，需要在山区地形中考虑地形影响。

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