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This paper proposed a method to retrieve the land surface reflectance from the HJ-1A/B CCD data. The aerosol optical depth(AOD), the most important factor affecting the atmospheric correction of CCD images at all bands, is proposed to retrieve from the CCD imagery by the approach of dense dark vegetation(DDV) method. A look-up table in terms of the transmittances, the path radiances and the atmospheric spherical albedo as functions of the AOD was established for a variety of sun-sensor geometry and aerosol loadings. The atmospheric correction is then achieved with the look-up table and the MODIS surface reflectance output(MOD09) as the priori datasets. Based on the retrieved AOD and the look-up table of atmospheric correction coefficients, the land surface reflectance was retrieved for the HJ-1A/B data according to the atmospheric radiative transfer equation. Some in-situ measurement Data for Yanzhou of Shandong province in East China and MODIS land surface reflectance products MOD09 are used to preliminarily validate the proposed method. The results show that the proposed method can remove effectively the atmospheric contributions, and the overall accuracy of the retrieval land surface reflectance can be improved substantially. 相似文献
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敦煌地区大气水汽和气溶胶对获取地表温度的影响 总被引:2,自引:0,他引:2
大气中的水汽和气溶胶含量是影响热红外波段数据的主要因素。针对敦煌地区,本文首先利用LOWTRAN-7辐射传输模型对1992年9月25日敦煌市西戈壁的一幅Landsat-5TM6波段的热红外图像数据进行了大气订正,获取了地表辐射温度。进而利用LOWTRAN-7通过模拟计算研究了该地区大气水汽和气溶胶含量的变化对TM6波段地面温度获取结果的影响,给出了对于热红外图像进行大气订正的主要判据。另外,文中还对热红外波段地面比辐射率的影响也进行了简单分析 相似文献
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