基于夜间灯光影像的太原市城市扩张特征及驱动力分析

随着城市化进程的推进,城市建成区范围不断扩大,在此过程中也出现了诸多问题。为更好地了解城市发展规律,本文选取1992、1997、2002、2007、2012年5期的DMSP/OLS数据和2017、2019年2期的NPP-VIIRS两种夜间灯光影像作为数据源,采用统计数据比较法提取太原市建成区范围,通过对太原市建成区形态扩张指数的分析,得出城市扩张规律。研究结果表明:①太原市建成区从1992-2019年太原市建成区面积增长了249.73km²,扩大了2.7倍,且建成区增长的面积主要集中在太原市的东南部。②2002-2012年和2017-2019年进入加速型扩张模式,扩张的速度快;1992-2019年太原市重心偏移距离为5676.42m,平均偏移速度为202.73m/a,重心位置总体向东南方偏移。③太原城市扩张的驱动力主要是受经济发展因素、人口因素、交通因素和政策规划因素的影响。本文为太原城市规划和空间结构调整提供理论依据和数据支撑。

Analysis of urban expansion characteristics and driving force analysis of Taiyuan city based on night light images

With the advancement of urbanization, the scope of urban built-up areas continues to expand, and many problems have emerged in this process. In order to better understand the law of urban development, DMSP/OLS data in five periods of 1992, 1997, 2002, 2007 and 2012 and NPP-VIIRS night light images as data sources in two periods of 2017 and 2019 are selected as data sources, and the scope of Taiyuan built-up areas is extracted by statistical data comparison method. Through the analysis of the temporal and spatial characteristics of the built-up area of Taiyuan, the law of urban expansion is obtained. The results show that: ① from 1992 to 2019, the area of Taiyuan built-up area increased by 249.73km², expanded by 2.6 times, and the growth of built-up area was mainly concentrated in the southeast of Taiyuan.② 2002-2012 and 2017-2019 belonged to the accelerated expansion mode, and the expansion speed was high. From 1992 to 2019, the shift distance of Taiyuan center of gravity was 5676.42m, the average migration speed was 202.73m/a, and the center of gravity generally shifted to the southeast. ③ The driving force of Taiyuan urban expansion mainly comes from the influence of economic development factors, population factors, transportation factors and policy planning factors. The research results provid theoretical basis and data support for Taiyuan urban planning and spatial structure adjustment.