基于夜间灯光遥感的城市垂直空间扩展研究——以武汉为例

Exploration of Urban Vertical Spatial Expansion Based on Nighttime Light Remote Sensing:A Case Study of Wuhan City

长期以来城市空间扩展研究主要针对城市水平空间的扩展模式研究,而忽视了城市垂直空间的扩展模式研究。以武汉市为例,利用长时间序列的DMSP/OLS夜间灯光数据集,在避免预设灯光变化规律的基础上对其进行校正,汇总统计城市建成区外延像元灯光强度值的变化特征,探测城市垂直空间扩展规律。结果表明城市像元灯光强度增强速度的统计特征与其所处的城市发展阶段有明显的关联性,并且符合“外延-增强-减速增强-稳定不变”的规律,其中“增强”阶段受城市发展规划和政策的影响明显。

For a long time,research on urban spatial expansion has focused mainly on urban horizontal space but neglected vertical space.Taking Wuhan city as an example,this paper collects the long time series DMSP/OLS nighttime light data and corrects it to avoid the preset law of light change.We explore the light intensity variation of the epitaxial pixels of the built-up areas of Wuhan city,and investigate the regularities of urban vertical spatial expansion.Results show that there is a significant correlation between the speed of lighting enhancement and the stages of urban development,which are stages of"denotation-enhancement-deceleration-enhancement-stability",Among them,the"enhancement"stage is significantly affected by urban development plan and policies.