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北京市1989-2010年地表温度时空分异特征分析

DOI: 10.6046/gtzyyg.2014.03.24, PP. 146-152

Keywords: 地表温度(LST),反演,时空分异,归一化水汽指数(NDMI),归一化建筑指数(NDBI)

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Abstract:

以3S技术为支持,采用TM数据、应用单窗算法对1989-2010年间北京市五环内地表温度(landsurfacetemperature,LST)进行反演,并采用同步的MODIS温度产品对反演结果进行对比验证。在此基础上,利用距平值分析和剖面线分析等方法揭示了20多a来北京市地表温度的时空分异总体特征;基于归一化水汽指数(normalizeddifferencemoistureindex,NDMI)和归一化建筑指数(normalizeddifferencebuildingindex,NDBI)分析了研究区内地表温度的时空变化特征,定量揭示并阐述了地表温度和NDMI及NDBI的相关关系。研究结果表明:反演温度可较为真实地反映研究区地表热量的空间差异;北京地表温度时空变化特征明显,同一时段、不同土地覆盖类型的地表温度差异较为显著,热岛效应明显;地表温度和NDBI呈显著的正相关,与NDMI则呈显著的负相关,NDMI和NDBI在表征地表热特征方面均是较好的指标。该结果为监测北京地表温度变化及其时空分布特征提供了依据。

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