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基于半约束条件下不透水面的遥感提取方法

DOI: 10.6046/gtzyyg.2014.02.09, PP. 48-53

Keywords: 不透水面,线性光谱混合模型,半约束条件

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Abstract:

不透水面作为城市生态环境的一个重要指标,被广泛应用于城市扩张监测、热岛效应分析及人类活动影响等方面的研究中。线性光谱混合模型构造简单、物理含义明确,是估算不透水面的主要方法。但是全约束的线性光谱混合模型容易在不透水面覆盖较低的地区(0~20%)出现高估,而在不透水面覆盖较高的地区(80%~100%)出现低估。因此,以黑龙江省富锦市为实验区,利用Landsat5TM图像,讨论了线性光谱混合模型在不同端元数目和约束条件下对不透水面的估算精度,发现三端元(高反射率地物、植被及土壤)半约束条件的线性光谱混合模型估算结果最优,其均方根误差为16.71%,并结合地表温度和植被覆盖度辅助分析,去除了水田对不透水面估算的影响,提高了不透水面的估算精度。

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