基于DMSP-OLS夜间灯光数据的中原城市群空间演变分析

RESEARCH ON SPATIAL EVOLUTION OF ZHONGYUAN URBAN AGGLOMERATION BASED ON DMSP-OLS NIGHTTIME LIGHT DATA

以中原城市群30个地级市为研究对象,基于1992-2012年DMSP-OLS夜间灯光遥感影像,借助MATLAB、Arc GIS等软件,提取了城市群建成区的空间范围,在此基础上,选取重心偏离轨迹、扩展度指标,并结合中原城市群规划中确定的"一核四轴四区"网络空间布局对城市群空间结构的聚散程度等进行了量化分析。结果表明:(1)1992-2012年,中原城市群建成区面积持续增长,由823.12 km2增加至2916.87 km2,其中,2004-2008年间建成区的年扩张强度最大;(2)中原城市群1992-2012年建成区重心迁移轨迹基本上呈"先东北后东南"的发展态势,东南方向建成区扩张速率最快,且城市群内部城市建设用地逐渐趋向于均衡化分布;(3)中原城市群的城市扩展度在1992-2012年间经历了"先减后增再减"的过程,整体上呈相对稳定的变化趋势。中原城市群的聚集度不断增大,且东部地区聚集度的增长速度最快。太原-郑州-合肥发展轴和北部跨区域协同发展示范区建成区的斑块形状趋于不规则。北部地区的分离度较大,且保持不断增大趋势。整体来看,中原城市群的连结度较小,但整体呈现上升趋势。

The study area incorporated the Zhongyuan urban agglomeration, located in the combination of the coastal open area and the central and western regions. It is the transition zone of China’s economy from east to west, and it plays an important role in Chinese industrial transfer and economic development. Spatial structure can not only reflect the interaction and relationship among cities within the urban agglomeration but also reflect the development stages and levels of urban agglomerations. Therefore, it is of great practical significance for the future sustainable development of the urban agglomeration to study the spatial structure.This article selected 30 provincially-administered cities of Zhongyuan urban agglomeration to analysis spatial structure evolution. DMSP-OLS nighttime light remote sensing images from 1992 to 2012 were used to extract the urban built-up area of 30 provincially-administered cities based on MATLAB and ArcGIS software. The results showed that: 1) the built-up area of the Zhongyuan urban agglomeration was persistently increased. The area has risen from 823.1238 km2 to 2916.87 km2. 2) the development trend of the barycenter of Zhongyuan urban agglomeration was basically "first northeast and then southeast". 3) the degree of expansion of the Zhongyuan urban agglomeration experienced a process of "decrease-increase-decrease" during the research period, but on the whole, there was a relatively stable trend of change.