基于GEE平台的山地城市城镇扩展演变研究——以重庆市主城区为例  

Urban Expansion and Evolution of Mountainous Cities Based on GEE Platform:A Case Study of Chongqing Downtown

作　　者：杨妍菲 张晓祥[1,2] 薛明慧 YANG Yanfei;ZHANG Xiaoxiang;XUE Minghui(College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Center for Geospatial Intelligence and Watershed Science,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水文水资源学院,江苏南京210098 [2]河海大学地理空间智能与流域科学研究中心,江苏南京210098

出　　处：《测绘地理信息》2022年第5期78-83,共6页Journal of Geomatics

基　　金：英国全球挑战研究基金GCRF项目(ES/P011020/1)

摘　　要：利用谷歌地球引擎(Google Earth Engine,GEE)云平台上的多源遥感卫星数据库,依据各地物的典型光谱特征,结合归一化建筑指数(normalized difference built-up index,NDBI)和GEE提供的随机森林分类算法,提取重庆市主城区20年长时间序列下的城市建成区。利用1999—2018年的城市扩张数据,通过探索性空间数据分析,对重庆市主城区的时空特征进行了探索。结果表明:(1)在时间尺度上,1999—2018年间,重庆市主城区建成区扩张总面积为612.12 km^(2),2009—2014年扩张最迅速,增长速度达到35.97 km^(2)/a。(2)在空间尺度上,重庆市主城区的扩张以渝中区为中心,沿西北方向的沙坪坝区扩张;同时城市扩张空间差异正在加大,长江两岸存在极化的趋势。Based on the multi-source remote sensing satellite database in Google Earth Engine(GEE)and typical spectral characteristics of various objects,we extract the urban builtup areas of Chongqing Downtown in 20 years with normalized difference built-up index(NDBI)by the random forest classification algorithm provided by GEE.The urban expansion data from 1999 to 2018 is used to reveal the spatiotemporal pattern of Chongqing Downtown with exploratory spatial data analysis(ESDA).The results show that,on the time scale,the total urban expansion area of build-up areas in Chongqing Downtown is 612.12 km^(2)from 1999 to 2008,and the fastest expansion period is in 2009—2014,with a speed of 35.97 km^(2)/a.On the spatial pattern,the expansion of Chongqing Downtown was centered on Yuzhong district and it extended to Shapingba District in the northwest direction.Meanwhile,the spatial difference of urban expansion is increasing and there is a trend of polarization on both sides of the Yangtze River.

关 键 词：谷歌地球引擎(Google Earth Engine GEE) 探索性空间数据分析 城市扩张 重庆主城区 

分 类 号：P237[天文地球—摄影测量与遥感]