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利用主被动微波遥感结合反演土壤水分的理论模型分析

DOI: 10.6046/gtzyyg.2011.02.10, PP. 53-58

Keywords: 主被动微波,TRMM,土壤水分

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Abstract:

为了更好地进行土壤水分反演,发展了一种基于热带降雨观测计划(TRMM)的主被动微波结合反演裸露地表土壤水分的算法。为了提高反演精度,同时利用TRMM搭载的测雨雷达(PR)和微波成像仪(TMI)进行观测。另外,针对PR/TMI数据,还建立了包含大范围的土壤水分和粗糙度参数的AIEM模型数据库。通过分析AIEM模型对地表后向散射和辐射的模拟发现,地表粗糙度参数对后向散射系数和亮温均有重要的影响。最后,在AIEM模型模拟数据库的基础上,利用理论模型——几何光学模型(GO模型)和半经验模型——Qp模型,通过对地表粗糙度参数的分析,结合TRMM/PR和TMI数据,建立了一种主被动微波遥感相结合的反演裸露地表土壤水分的模型,并进一步获得了反演土壤水分的算法。

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