本文开展了HJ-1 CCD相机数据大气校正方法的研究工作。基于辐射传输模型构建了不同大气条件下的大气校正系数查找表;大气校正中用到的气溶胶光学厚度数据基于浓密植被区域红蓝波段地表反射率之间的关系反演得到。与对应当天的MODIS地表反射率数据的对比分析表明,本文提出的大气校正方法具有较高的精度。本文还从气溶胶光学厚度的反演精度、大气水汽含量的变化、辐射定标精度、海拔高度等方面对大气校正的不确定性进行了分析。

We proposed a new atmospheric correction approach for HJ-1 CCD datasets, in which the aerosol optical depth (AOD) is acquired based on the relationships between surface refl ectance of the blue band and red band over dense dark vegetation (DDV) regions. The atmospheric correction look-up tables (LUTs) were introduced to provide atmospheric correction coefficients under different aerosol loadings and sun-view geometry. The comparison of the results with intraday MODIS (Moderate Resolution Imaging Spectroradiometer) surface refl ectance out-puts (MOD09) indicated the proposed atmospheric correction method has preferable accuracy. We did uncertainty analyses from the aspects of AOD retrieval accuracy, radiometric calibration accuracy, altitude impact and atmospheric water vapor con-tent impact.