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Modeling sky luminance using satellite data to classify sky conditions

机译：使用卫星数据对天空亮度进行建模以对天空条件进行分类

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摘要

A model for calculating sky luminance is presented. The earth-atmospheric reflectivity obtained from satellite data was used to classify sky conditions. The proposed sky luminance at a specific point in the sky hemisphere is a product of two functions, namely F_1 and F_2. For any point in a sky hemisphere, F_1 varies with the sky zenith of the considered point (Z) and F_2 is a function of the angular distance between the considered point and the sun (x). The model uses simultaneous measurements of sky luminance and GMS-5 satellite observation, both taken at Nakhon Pathom, Thailand (13.70°N, 103.10°E), during November 2002 to May 2003. Both F_1 and F_2 are derived as polynomial functions of x, Z and the solar zenith angle (Z_s) for each sky condition. The classification of the sky condition is based on the satellite-derived earth-atmospheric reflectivity. This sky luminance model was validated against independent measurements from the Asia Institute of Technology (AIT) (14.08°N, 100.62°E). The root mean square difference (RMSD) between the relative sky luminance calculated from the model and that obtained from the measurement is 0.133.
机译：提出了一种计算天空亮度的模型。从卫星数据获得的地球大气反射率用于对天空条件进行分类。提议的在天空半球特定点的天空亮度是两个函数F_1和F_2的乘积。对于天空半球中的任何点，F_1随所考虑点（Z）的天空天顶变化，而F_2是所考虑点与太阳（x）之间的角距离的函数。该模型同时使用了2002年11月至2003年5月在泰国佛统（13.70°N，103.10°E）拍摄的天空亮度和GMS-5卫星观测值。F_1和F_2均作为x的多项式函数导出，Z和每个天空条件的太阳天顶角（Z_s）。天空状况的分类基于卫星衍生的地球大气反射率。该天空亮度模型已针对亚洲技术学院（AIT）的独立测量结果进行了验证（北纬14.08°，东经100.62°）。根据模型计算得出的相对天空亮度与根据测量得出的相对天空亮度的均方根差（RMSD）为0.133。

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