太阳高度角对图像能量的影响及其校正

在研究以太阳光为主的可见光波段的大气辐射传输过程中,成像时遥感器位置的变化导致了太阳高度角有所变化,从而使图像接收的能量有所不同。阐明了太阳高度角的基本概念并利用辐射传输模型Modtran5定量分析了不同太阳高度角对遥感器入瞳处能量的差别,在总结其他学者研究天顶角校正的基础上通过数值模拟的方法建立不同天顶角时刻的辐射能量同0天顶角的辐射能量的关系模型,从而实现校正。校正后的入瞳处辐亮度同原0天顶角辐亮度对比,校正结果相对误差小于1%,结果较为理想。

Abstract

In the process of atmospheric radiative transmission in the visible light band, the measured value of sun angle changed along with the remote sensor’s position, and the images received different energy. The basic concepts of solar elevation angle are illustrated and radiative transfer mode code Motran5 is used to quantitatively analyze the difference of energy with various solar elevation angle. By summarizing the method of solar elevation angle correction of other scholars, a model of radiance between different solar elevation angle and 0 sun elevation angle is built by numerical simulation method, a correction method is put forward by means of the model. A comparison between correction and 0 radiance is carried out, relative error of less than 1% shows that the correction is desirable.

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栗琳, 胡勇, 巩彩兰, 祝令亚, 赫华颖. 太阳高度角对图像能量的影响及其校正[J]. 大气与环境光学学报, 2013, 8(1): 11. LI Lin, HU Yong, GONG Cai-lan, ZHU Ling-ya, HE Hua-ying. Solar Elevation Angle’s Effect on Image Energy and Its Correction[J]. Journal of Atmospheric and Environmental Optics, 2013, 8(1): 11.

太阳高度角对图像能量的影响及其校正

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