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一种协同反演气溶胶与水汽含量的高光谱图像大气校正算法

DOI: 10.6046/gtzyyg.2015.02.04, PP. 22-28

Keywords: 气溶胶模式,气溶胶光学厚度(AOT),水汽含量(WV),高光谱,大气校正

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Abstract:

大气校正是高光谱图像定量反演地表参数的前提。为充分利用高光谱数据本身的光谱特点,提出了一种协同反演大气气溶胶光学厚度(aerosolopticalthickness,AOT)与水汽含量(watervaporcontent,WV)的大气校正方法,在同时考虑了气溶胶模式、AOT和WV这3个因素的综合影响基础上,采用循环迭代的思想,基于6S辐射传输模型,反演大气参数及地表反射率,弥补了现有反演算法中没有同时考虑AOT与WV的不足;并以武汉市Hyperion高光谱图像为例,验证了该算法的有效性。从与FLAASH算法及MOIDS提供的AOT和WV产品对比来看,该算法能较好地校正气溶胶与水汽对高光谱图像的影响,且反演过程中所有的输入均来自图像数据本身或6S辐射传输模型,无需输入额外的参数。

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