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南京市地表参数变化与热岛效应时空分析

DOI: 10.6046/gtzyyg.2014.02.28, PP. 177-183

Keywords: 归一化植被指数(NDVI),改进的归一化水体指数(MNDWI),归一化不透水面指数(NDISI),归一化建筑指数(NDBI),地表温度,城市热岛,南京市

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Abstract:

利用南京市1989年TM和2001年、2010年ETM+卫星遥感数据,提取了3个时期的归一化植被指数(normalizeddifferencevegetationindex,NDVI)、改进的归一化水体指数(modifiednormalizeddifferencewaterindex,MNDWI)、归一化建筑指数(normalizeddifferencebuild-upindex,NDBI)和归一化不透水面指数(normalizeddifferenceimpervioussurfaceindex,NDISI)等地表参数;利用热红外波段遥感数据反演地表温度,并从时间维对比分析了3个时期各个参数的变化和产生的原因;利用回归分析方法探讨了上述地表参数变化与城市地表温度之间的关系,即地表温度与NDISI和NDBI呈正相关,与NDVI呈负相关。进一步分析表明,南京市最近20a来不透水面和建筑面积大幅增大,植被覆盖范围减少,城市热岛效应加剧,不透水面、建筑指数与地表温度的变化趋势和城市扩张趋势一致。该研究成果对于揭示南京市热岛效应、优化土地配置和推进生态城市建设具有一定的参考意义。

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