夜光遥感视角下京津冀城市群时空变化特征分析

Characteristics of Temporal and Spatial Variation of Beijing-Tianjin-Hebei Urban Agglomeration From The Perspective of Night-Light Remote Sensing

为探究京津冀城市群城市规模的演变特征,基于NPP-VIIRS长时序夜光遥感影像,综合运用夜光变化率、位序规模法、重心迁移轨迹与标准差椭圆的方法,分析2012~2020年京津冀城市群时空格局演变特征。结果表明:2012~2020年间,京津冀城市群各城市夜间灯光总量呈逐年递增,整体平均增长率超过130%;京津冀城市群中心城市对周边地级市辐射带动作用逐渐增强,城市体系规模分布逐渐由单个城市高位序主导转向多城市均衡发展的模式;城市群空间演变格局表现为东北-西南的趋势,城市群重心按逆时针方向整体迁移9.756 km,其中2012~2016年城市群向东北方向迁移7.631 km,农产品主产区、生态功能区、重点开发区起主要拉力作用,2016~2020年由于重点开发区的建设,城市群向西南方向迁移13.764 km。该项研究可为京津冀城市群及我国其他城市群时空演变研究提供数据支持及方法借鉴。

In order to explore the evolution characteristics of urban scale in Tianjin-Beijing-Hebei urban agglomeration,based on NPP-VIIRS long time series nighttime light remote sensing images,the evolution characteristics of spatial and temporal pattern of Tianjin-Beijing-Hebei urban agglomeration from 2012 to 2020 were analyzed by using nighttime light change rate,rank-scale method,gravity centermigration trajectory and standard deviation ellipse.The results show that the total amount of nighttime lighting in each city of Beijing-Tianjin-Hebei urban agglomeration increased year by year from 2012 to 2020,and the overall average growth rate exceeded 130%.The radiating and driving effect of the central cities in Beijing-Tianjin-Hebei urban agglomeration on the surrounding prefecture-level cities is gradually increasing,and the scale distribution of the urban system is gradually shifting from a single city dominated by high-ranking to a multi-city balanced development model.The spatial evolution pattern of urban agglomerations shows a trend from northeast to southwest.The gravity centerof urban agglomerations moved 9.756 km in an anti-clockwise direction.Urban agglomerations moved 7.631 km to the northeast from 2012 to 2016.The main agricultural production areas,ecological function areas and key development zones play a major pulling force.Due to the important pulling force of key development zones,urban agglomerations moved 13.764 km to the southwest from 2016 to 2020.The research can provide data support and method reference for the study of spatio-temporal evolution of Beijing-Tianjin-Hebei urban agglomeration and other urban agglomerations in China.