Time-Space Character Analysis of Urban Heat Island Effect in Nanjing City Using Remote Sensing
南京市热岛效应时空特征的遥感分析

Urban heat island effect is the typical representation of urbanization impacts on urban climate.The urban heat island has different time and spatial characteristics for a different urban because of different urbanization level,essence,size and nature condition.The paper analyzes the time and space characteristics of Nanjing city combing high space-resolution Landsat TM with high time-resolution MODIS.This paper analyzes daily characteristics of UCL heat island by eight granule MODIS,seasonal characteristics by sixteen granule MODIS and probes the scale effect of UCL heat island.The diurnal urban heat island intensity is stronger than overnight's.The strongest intensity of urban heat island happens on autumn,the second on summer,the third on spring,the last on winter.The most extensive in scope occurs in summer,the second in autumn,the third in spring, the last in winter.There are three continuous and extensive heat islands in Naning city.The largest area heat island takes on clustere shape,distributing both the riversides of Qinhuai River.The second is the lineal shape along Rehe Road,Jiangnin Road,Longpan Road,Hongshan Road and Heyan Road.The third presents zonal shape and distributes the industry land use in Dachang district and Pukou district.The intensity and scope of urban heat island results are different with different remote scale.The intensity and scope of urban heat island in Naning city respectively using TM and MODIS on April 17,2000 and the scope and intensity using TM are all lager than that using MODIS.