基于GIS的城市扩张监测与驱动力分析

Monitoring and driving force analysis of urban expansion based on GIS

准确的城市建设用地信息,能够反映城市扩张的动态变化,对于提供决策指导城市化建设和规划具有非常重要的意义。本文以南昌市作为研究区域,选取2000年、2010年、2020年三期30m全球地表覆盖数据(GlobeLand30)影像数据作为主要数据源,利用土地利用转移矩阵模型对城市用地变化情况的变化量和动态度进行定量分析,利用扩张指数模型等研究了南昌市20年间的扩张面积、速度、强度、紧凑度、分形维数、重心转移距离和扩张方位等,对城市扩张的驱动力进行了定性分析,并利用灰色关联分析法进行了定量分析。结果表明,南昌市经济和人口因素与城市扩张显著相关,研究内容在土地管理与合理利用土地、城市发展和规划以及城市的健康发展方面为管理部门提供了支持。

Accurate information on urban construction land can reflect the dynamic changes of urban expansion,which is of great significance for guiding decision-making in urbanization construction and planning.This paper studied Nanchang City and selected the GlobeLand 30 image data from 2000,2010,and 2020 as the main data sources.The land use transfer matrix model was used to quantitatively analyze the amplitude and dynamic degree of urban land use changes.The expansion index model and other methods were employed to study the expansion area,speed,intensity,compactness,fractal dimension,center of gravity transfer distance,and expansion direction of Nanchang City over the past 20 years.In addition,the driving force of urban expansion was qualitatively analyzed,and quantitative analysis was performed using the grey correlation analysis method.The results indicate that the economic and demographic factors of Nanchang City are significantly correlated with urban expansion,which provides support for management departments in land management and rational use of land,urban development and planning,and healthy urban development.