基于MODIS数据的城市热岛动态监测及时空变化分析.docx

基于MODIS数据的城市热岛动态监测及时空变化分析
摘要
城市热岛效应作为城市化的重要表现,在城市生态和人居环境方面有着重要意义。本文利用MODIS数据对某城市热岛效应的时空变化进行分析，结果显示该城市热岛效应逐年加剧，夏季表现尤其明显，且热岛中心区域持续向外扩散。同时，热岛效应的时空变化受到城市规模、经济发展水平、地形等因素的影响。因此，应该采取措施减缓城市热岛效应对城市生态和人居环境造成的负面影响。
关键词：城市热岛；MODIS数据；时空变化；影响因素
Introduction
城市热岛效应是指城市区域与周围地区相比，由于城市建筑、地表材质、人类活动等因素导致夜间地面温度增加、能量辐射态行为改变的现象。随着城市化进程的加速，城市热岛效应在全球范围内显著加剧，给城市空气环境、生态系统和健康带来了一系列的负面影响。因此，如何有效监测和管理城市热岛效应变得非常重要。
Remotesensingtechnologyhasbeenwidelyusedinthestudyofurbanheatislands.Withitsadvantagesoflargecoverage,continuousmonitoringandmulti-spectralimaging,MODISdatacaneffectivelydetectchangesinurbanlandcover,temperature,andvegetation.Inthisstudy,MODISdatawasusedtodynamicallymonitorandanalyzethespatio-temporalchangesoftheurbanheatislandeffectinacertaincity.
MaterialsandMethods
ThestudyareaisatypicallargecityinChinawithapopulationofover10millionandadevelopedeconomy.MODISdatafrom2005to2019wereobtainedfromtheNASAEarthObservatorywebsite.Thedatawerepreprocessed,includingatmosphericcorrection,geometriccorrection,anddatafusion.Thelandsurfacetemperature(LST)datawasextracted,andtheannualandseasonalaveragetemperatureandtemperaturedifferencewerecalculated.ArcGISsoftwarewasusedtogenerateLSTmapsandconductspatialanalysis.Inaddition,relevanturbandata,suchaspopulation,economicdevelopmentlevel,andtopography,werecollectedandanalyzed.
Results
Theresultsshowthattheurbanheatislandeffecthasbecomeincreasinglysevereinthestudyarea.From2005to2019,theaverageLSTofthestudyareaincreasedfrom25.8℃to28.3℃.Thetemperaturedifferencebetweentheurbancenterandthesurroundingareasalsoincreasedfrom1.8℃to2.5℃.Thesummerseasonexhibitedthemostobviousurbanheatislandeffect,andtheurbanheatislandcenterareacontinuouslyexpandedoutward.Inaddition,thestudyalsofoundthatthespatio-temporalchangesoftheurbanheatislandeffectareaffectedbymultiplefactors,includingurbanscale,economicdevelopmentlevel,andtopography.
Discussion
Theintensificationoftheurbanheatislandeffectinthestudyareaismainlyduetotherapidurbanizationandexpansionofconstructionland.Theincreasei