Effects of Aerosol Optical Thickness on the Optical Remote Sensing Imaging Quality
HU Xin-li1，2, GU Xing-fa1，2, YU Tao1，2, ZHANG Zhou-wei1，3*, LI Juan1, LUAN Hai-jun4
1. The Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101，China 2. The Center for National Space-borne Demonstration, Beijing 100101, China 3. School of Earth and Space Sciences, Peking University，Beijing 100871, China 4. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China
Abstract：In recent years, due to changes in atmospheric environment, atmospheric aerosol affection on optical sensor imaging quality is increasingly considered by the load developed departments. Space-based remote sensing system imaging process, atmospheric aerosol makes optical sensor imaging quality deterioration. Atmospheric medium causing image degradation is mainly forward light scattering effect caused by the aerosol turbid medium. Based on the turbid medium radiation transfer equation, the point spread function models were derived contained aerosol optical properties of atmosphere in order to analyze and evaluate the atmospheric blurring effect on optical sensor imaging system. It was found that atmospheric aerosol medium have effect on not only energy decay of atmospheric transmittance, but also the degradation of image quality due to the scattering effect. Increase of atmospheric aerosol optical thickness makes aerosol scattering intensity enhanced, variation of aerosol optical thickness is also strongly influences the point spread function of the spatial distribution. it is because the degradation of aerosol in spatial domain, which reduces the quality of remote sensing image, in particularly reduction of the sharpness of image. Meanwhile, it would provide a method to optimize and improve simulation of atmospheric chain.
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