基于夜间灯光遥感的成都市建成区扩张时序演变分析

Analysis of the Temporal Evolution of Built-Up Area Expansion in Chengdu Based on Night Light Remote Sensing

【目的】探究2007—2017年成都市建成区扩张变化及发展趋势。【方法】以成都市为研究区,基于夜间灯光数据,利用支持向量机法提取2007、2012、2017年成都市建成区,结合城市扩张强度、扩张速度、重心等指标,探讨10年间成都市建成区扩张演变趋势。【结果】结果表明:(1)2007—2012年,成都市建成区面积扩张了106.87 km^(2);2012—2017年,成都市建成区面积扩张370.08 km^(2),10年间建成区面积扩张明显,城市发展迅速。(2)2007—2017年,成都市建成区主要以成华、青羊、武侯为中心向四周扩张,各区县建成区连贯性和面积均有所增加,城市发展重心逐渐往东南方向迁移,整体呈现“中心聚集,环状向外扩张”特征。【结论】研究结果能够为成都市城市建设和发展提供参考。

[Purposes]This paper explores the expansion changes and development trends of built-up areas in Chengdu from 2007 to 2017.[Methods]Taking Chengdu as the study area,based on the nighttime light data,the support vector machine method was used to extract the built-up areas of Chengdu in 2007,2012 and 2017,and the expansion evolution trend of the built-up areas of Chengdu in the past 10 years was discussed by combining the urban expansion intensity,expansion speed and center of gravity.[Findings]The results show that:①From 2007 to 2012,the built-up area of Chengdu expanded by 106.87 km^(2),and from 2012 to 2017,the built-up area of Chengdu expanded by 370.08 km^(2),doubling the built-up area in 10 years.The trend of expansion is obvious,and the city is developing rapidly.②From 2007 to 2017,the built-up area of Chengdu mainly expanded to the surrounding areas with Chenghua,Qingyang and Wuhou as the center,and the coherence and area of the built-up areas of each district and county increased,and the center of gravity of urban development gradually shifted to the southeast,showing the characteristics of"central agglomeration and circular outward expansion".[Conclusions]The research results can provide a reference for the urban construction and development of Chengdu.