基于夜间灯光的2000—2018年成渝地区城市化过程研究

成渝城市群正逐步成为我国西部经济发展的增长极，探索其城市化时空格局对区域协调发展具有指引作用。基于2000—2018年整合夜光遥感数据提取城市群多期建成区空间范围，运用夜光规模统计、标准椭圆、位序—规模法则以及空间自相关等指标、模型定量分析了成渝区域城市化时空过程。结果表明：(1)灯光与统计数据配合下的建成区提取多年平均误差为1.27%，重庆、成都和绵阳市提取验证效果好；(2)19年间成渝各城市夜光规模显著增长，整体累计增长5.6倍，2010年后成渝城市群灯光规模扩张速度显著；(3)区域内各城市的位序—规模（rank-size）由高位序城市集中发展转向区域协调均衡发展，中小城市均有不同程度的扩张；(4)城市群规模重心位于四川资阳市安岳县，重心移动整体上以东南方向为主，空间格局整体呈现以“成都—重庆”为轴线沿西北向东南演变，空间范围逐渐扩张，说明以重庆为主的东南都市圈的社会经济形势更显著，对城市群发展更具影响力；(5)成渝城市群扩展的空间集聚程度逐渐加强，冷热点格局整体呈现冷点区占比大，热点区占比低的特征，热点区主要出现在位于成都与重庆主城区及其周边城镇。研究揭示了成渝城市群均衡发展的特...

Research on the Spatial-Temporal Process of Urbanization in Chengdu-Chongqing Region based on Nighttime Light from 2000 to 2018

Chengdu-Chongqing urban agglomeration is gradually becoming the growth pole of economic development in western China. Exploring the spatial and temporal pattern of urbanization in Chengdu-Chongqing urban agglomeration has a guiding role for regional coordinated development. Based on the integrated nighttime light remote sensing data from 2000 to 2018， this paper extracted the spatial scope of multi-stage built-up areas of urban agglomerations， using noctilucent scale statistics， standard ellipse， rank-size rule and spatial autocorrelation and other indicators and models to quantitatively analyze the spatial and temporal process of urbanization in this region. The main conclusions are as follows： （1） the multi-year average error of the built-up area extraction with the combination of light and statistical data is 1.27%， which is effective in Chongqing， Chengdu and Mianyang. （2） In the past 19 years， the scale of noctilucent in Chengdu-Chongqing cities increased significantly， with an overall cumulative increase of 5.658 times. After 2010， the scale of light in Chengdu-Chongqing urban agglomeration expanded significantly； （3） The rank-scale of cities in the region shifted from the concentrated development of high-ranking cities to the coordinated and balanced development of the region， and small and medium-sized cities all expanded to varying degrees； （4） The center of gravity of urban agglomeration is located in Anyue County， Ziyang City， Sichuan Province. The center of gravity movement is mainly in the southeast direction， and the spatial pattern evolves along the axis of "Chengdu-Chongqing" from northwest to southeast， indicating that the southeast metropolitan circle dominated by Chongqing has a stronger radiating and driving role and has more influence on the development of urban agglomeration. （5） The spatial agglomeration degree of Chengdu-Chongqing urban agglomeration is gradually strengthened. The overall pattern of cold hot spots is characterized by a large proportion of cold spots and a low proportion of hot spots. The hot spots are mainly located in the main urban areas of Chengdu and Chongqing and their surrounding towns. This study reveals the characteristics and hotspots of balanced development of Chengdu-Chongqing urban agglomeration， which can be used as a reference for future urban function planning and investment decisions.