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融合多源遥感数据生成高时空分辨率数据的方法对比

Keywords: 多源遥感数据,数据融合,高时空分辨率,混合像元分解

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Abstract:

融合多源遥感数据生成高时空分辨率数据具有重要的应用价值.对目前常用的3种时空融合方法进行对比分析, 即基于时序数据(STIFM)、基于混合像元分解(STDFM)和增强型自适应遥感图像(ESTATFM)的时空融合方法.以盈科灌区为例, 由多时相的MODIS数据提取地物的时间变化信息, 结合初期的ASTER/TM影像的空间信息, 融合生成30m具有MODIS时间分辨率的数据.以真实的ASTER数据为基准, 从光谱特征和地物类别的角度定量评价结果, 表明STDFM和ESTATFM分别在红波段和近红外波段取得效果最优, 相关系数分别为0.91和0.71, 3种方法融合的NDVI效果基本相当, 相关系数均高于0.84.在地物类别空间信息的表达方面, ESTATFM方法在异质性较强的玉米和小麦区域具有较好的适用性

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