太湖地区HJ-1卫星CCD数据反演气溶胶及大气校正

针对HJ-1卫星CCD数据,利用改进的暗像元法反演气溶胶光学厚度(AOD),再利用反演的AOD对其进行大气校正。将反演的气溶胶与地基太阳光度计数据进行对比验证,发现当反演的AOD值大于0.2时,反演值与地基观测值的相关系数为0.964,符合MODIS业务化反演AOD的精度要求。再将反演得到的气溶胶带入6S辐射传输模型中,对HJ-1卫星CCD数据进行大气校正实验。结果表明,该方法能有效提高HJ-1卫星CCD数据大气校正的精度,更好地复原地物的真实光谱信息。

Aerosol retrieval and atmospheric correction of HJ-1 satellite CCD data over land surface of Taihu Lake

Atmospheric correction is an important step to extract quantitative information from remote sensing data .An atmospheric correction method with the HJ‐1 satellite CCD data using a modified dark dense vegetation method retrieved the aerosol optical depth (AOD) is developed .Comparing the retrieved result with sun‐photometer observations ,it is found that when the retrieved AOD is greater than 0.2 ,the retrieved AOD reaches 0.964 correlation with sun photometer observations and conforms to the requirements of the MODIS data inversion precision of the AOD .Then atmospheric correction has been applied to HJ‐1 satellite CCD data by using 6S Radiation Transfer Model with the retrieved AOD .With the retrieved AOD as an input ,HJ‐1 satellite CCD data over land surface of Taihu Lake is significantly improved after the atmospheric correction .