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Landsat长时间序列数据格式统一与反射率转换方法实现

DOI: 10.6046/gtzyyg.2014.04.13, PP. 78-84

Keywords: Landsat,长时间序列数据,格式统一,LEDAPS,反射率转换

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Abstract:

介绍了一种长时间序列遥感影像预处理程序,即陆地卫星生态系统干扰自适应处理系统(landsatecosystemdisturbanceadaptiveprocessingsystem,LEDAPS)。该程序通过使用MODTRAN太阳能输出模型,校正太阳方位、日地距离、TM或ETM+带通以及太阳辐照度,将定标影像转换为表观(top-of-atmosphere,TOA)反射率影像,并将通过浓密植被(darkdensevegetation,DDV)算法插值生成的气溶胶光学厚度(aerosolopticalthickness,AOT)以及通过相关资料获得的臭氧(O3)浓度、大气压及水汽值等用于6S辐射传输模型,生成地表反射率产品。以LEDAPS可处理的标准数据Landsat7ETM+和统一格式后的非标准数据Landsat5TM影像为例,介绍了长时间(1987—2011年)序列数据的选择、格式统一以及算法的实现过程,同时给出了校正后影像效果评价的方法。结果表明,标准数据和非标准数据经过LEDAPS处理后生成的地表反射率产品能有效降低大气中O3、水汽及气溶胶等对影像真实反射率的影响,为土地覆盖变化和干扰因素等的长时间序列监测和生物物理参数的遥感反演提供科学产品,有助于在国内形成处理长时间序列影像数据的准则。

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