耦合京津冀气溶胶模式的HJ-1卫星CCD数据大气校正

发布时间：2018-04-10 15:33

本文选题：大气校正 + 气溶胶　；参考：《光谱学与光谱分析》2016年05期

【摘要】：针对目前HJ-1CCD大气校正没有考虑中国地区气溶胶模式的问题,提出一种耦合中国地区局部气溶胶模式的大气校正方法。以京津冀地区作为研究区域,该方法对地基北京城区和香河站点反演的气溶胶模式参数进行聚类,得到京津冀地区具有代表性的四类气溶胶模式,并根据四类气溶胶模式来建立查找表进行气溶胶光学厚度的反演。HJ-1CCD数据没有短波红外波段(2.12μm),无法采用MODIS的气溶胶算法中获得地表反射率的方法来计算蓝红波段的反射率,本文在气溶胶光学厚度的反演中采用HJ-1卫星的蓝色(0.43~0.52μm)和红色(0.63~0.69μm)波段的反射率比值作为误差方程的依据,不需要输入地表目标的反射率。基于反演后的光学厚度对HJ-1CCD数据进行大气校正,并与ASD光谱辐射计测量数据以及MODIS地表产品数据(MOD09)进行对比。结果表明,该方法得到的大气校正结果与ASD测量结果接近,并与MOD09有较强的相关性,红色波段的平均相关系数达到了0.8以上,受气溶胶影响最大的蓝色波段平均的相关系数也达到了0.75左右。
[Abstract]:In view of the fact that the current HJ-1CCD atmospheric correction does not consider the aerosol model in China, an atmospheric correction method coupled with the local aerosol model in China is proposed.Taking the Beijing-Tianjin-Hebei area as the research area, this method is used to cluster the parameters of aerosol model retrieved from the ground-based Beijing urban area and the Xianghe station, and four representative aerosol models are obtained in the Beijing-Tianjin-Hebei region.According to four kinds of aerosol models, a look-up table is established to retrieve the aerosol optical thickness. HJ-1CCD data have no short-wave infrared band of 2.12 渭 m, so it is impossible to calculate the reflectivity of blue-red band by using the method of obtaining surface reflectivity in MODIS's aerosol algorithm.In this paper, the reflectivity ratios in the blue band of HJ-1 satellite and in the band of 0.63 ~ 0.69 渭 m) are used as the basis of the error equation in the inversion of aerosol optical thickness, and the reflectivity of the surface target does not need to be input.The atmospheric correction of HJ-1CCD data is carried out based on the inversion optical thickness, and compared with ASD spectral radiometer data and MODIS surface product data (MOD09).The results show that the result of atmospheric correction obtained by this method is close to that of ASD and has a strong correlation with MOD09. The average correlation coefficient of red band is more than 0. 8.The average correlation coefficient of blue band, which is most affected by aerosol, is about 0.75.
【作者单位】：首都师范大学城市环境过程与数字模拟国家重点实验室培育基地;首都师范大学三维信息获取与应用教育部重点实验室;中国科学院遥感与数字地球研究所;
【基金】：国家自然科学基金项目(41401386)资助
【分类号】：X87

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