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基于最佳极化组合和入射角的土壤水分反演
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摘要
为了较高精度的反演大范围裸土地表土壤水分,利用C波段多极化合成孔径雷达ASAR影像数据,发展了一种新的土壤水分反演算法估计裸土土壤水分。该算法基于AIEM模拟数据通过回归分析,建立了不同后向散射系数极化比与组合粗糙度的粗糙度计算模型,得到VV和VH后向散射系数极化比与组合粗糙度的相关系数最高。利用多角度模拟数据推导建立不同角度的土壤水分经验反演模型,发现小入射角反演模型所得土壤水分和AIEM输入土壤水分相关系数更高。基于此建立VV/VH最佳极化组合和小入射角的土壤水分半经验反演模型。验证结果表明:模型估计结果与实测数据具有较高的相关性,R2达到了0.778 6。该模型无需实测粗糙度数据,就可以实现较高精度裸土地表土壤水分反演。
引文
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