基于遥感监测数据的“南新走廊”北部三城市发展研究

Research on the Development of Three Northern Cities in the"Nanxin Corridor"Based on Remote Sensing Monitoring Data

开展城市扩张时序演变分析对实现城市精准管控和促进城市高质量发展具有积极意义。以“南新走廊”北部地区中国南宁、越南河内、老挝万象为研究对象,基于2000,2010和2020年的遥感影像资料,采用指数法提取了研究区3期地表不透水面,探讨了其城市扩张时序演变特征。结果表明:在城市扩张强度方面,2000~2020年研究区的城市建设用地面积在逐年增加,万象的扩张强度最大,其次为南宁、河内;在城市扩张速率方面,整个研究时期3个城市的扩张速率都大于0,所以研究区3个城市都是加速扩张类型;城市空间紧凑性分析表明,南宁、河内、万象在2000~2020年,城市紧凑性指数为稳定状态,表明城市扩张空间发展维持稳定;城市重心演变轨迹表明,在整个研究时期,南宁城市重心总体向北方向移动;河内城市重心总体转移方向为西方向;万象城市重心总体偏移方向为北方向;研究区在20年期间的城市建设用地面积和城市人口比例逐年增加,表明这二者之间有一定的相关性。

The analysis of the temporal evolution of urban expansion is of positive significance to realize accurate urban control and promote high-quality urban development.Based on the remote sensing image data of Nanning,Hanoi,Vietnam and Vientiane in the northern area of Nanxin Corridor,China,and the region in 2000,2010 and 2020,the index method was used to extract the study area phase 3 to explore the temporal evolution characteristics of the urban expansion.The results show that,in terms of urban expansion strength,from 2000 to 2020,the urban construction land area in the study area is increasing year by year.Vientiane has the greatest expansion intensity,next is Nanning and Hanoi;In terms of the urban expansion rates,the expansion rate of the three cities throughout the study period was greater than 0.Therefore three cities in the study area are all accelerated expansion types;The compactness analysis shows that the compactness index of Nanning,Hanoi and Vientiane is stable from 2000 to 2020,indicating that the spatial development of urban expansion is stable.The evolution trajectory of the urban center of gravity shows that,throughout the study period,Nanning's urban center of gravity is generally moving to the north;The urban shift direction of Hanoi is western;the urban shift direction of Vientiane is north;The urban construction land area and the proportion of urban population in the study area increased annually during the 20 years,indicating that there is a certain correlation between the two.