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中巴地球资源卫星热红外通道的交叉辐射定标

Keywords: 热红外通道光谱匹配交叉定标线性回归法

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Abstract:

以TERRAMODIS传感器热红外31通道为参考标准,完成对CBERS-02IRMSS传感器热红外通道的交叉辐射定标.在与MODIS相应通道的交叉辐射定标中选取了2004年8月~12月间的7次双星同步观测青海湖和太湖的昼夜数据,通过两传感器相应通道间的光谱匹配,利用MODIS数据推算IRMSS的入瞳辐亮度,再从IRMSS影像上提取对应的DN值.对交叉定标获取的数据,进行多点线性回归,获得定标系数:增益8.0567,单位:DN/(W/m^2/sr^1/μm^1);截距47.892,单位:DN.并对定标数据进行了精度评价和检验,结果表明该方法所获取的定标系数精度与MODIS定标数据相当,可以满足定量化应用的需要。

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