POI和夜间灯光融合数据用于城乡结合部空间划定的研究——以武汉市为例

Spatial Delimitation of the Urban-Rural Fringe Based on POI and Nighttime Light Data: A Case Study of Wuhan City

  • 摘要: 城乡结合部边界识别是城乡精细规划与治理的基础工作,对于土地可持续利用、城乡一体化等进程具有推动作用。以往城乡结合部划分存在数据源单一、获取困难、时空分辨率低的不足,本研究基于电子地图兴趣点(POI)和夜间灯光融合数据(NPP/VIIRS),结合城乡空间结构关系,提出了一种新的城乡结合部空间识别方法,以武汉市为例,求得城乡结合部边界,利用土地利用结构信息熵、NDVI以及人口密度数据对划定结果进行验证和比较,并对典型区域进行了野外实地校核。结果表明:(1) NPP&POI能够综合POI与夜间灯光中设施类型、光照强度和分辨率差异的特征,相较于单独采用POI、夜间灯光和人口密度数据识别出的城乡结合部边界准确度更高、时效性更强;(2) NPP&POI相较于土地利用、景观等数据更能表征城乡发展活力,定量识别的出城乡潜在中心区与多层结构对于城乡基础设施的配置、产业分工、生态职能划分等研究具有参考意义;(3) NPP&POI在城乡空间上的二次突变规律证实了城乡结合部作为城市扩张过程中产生的地域实体客观存在,为城乡三元结构理论提供了实证支撑。

     

    Abstract: Objectives: The boundary identification of urban-rural fringe is the basic work of urban-rural fine planning and governance, plays an important role in promoting the sustainable use of land, urban-rural integration and other processes. The purpose of this study is to solve the problems of single data source selection, difficulty in data acquisition, low temporal and spatial resolution in the past recognition of urban-rural fringe. Methods: Taking Wuhan as an example, this study uses the breakpoint analysis method to obtain the boundary of urban-rural fringe. Land use structure information entropy, NDVI and population density data are used to verify and compare the delineation results, and field visits and analysis are conducted for typical regions. Results: 1)NPP&POI can integrate the characteristics of difference in facility type, light intensity and resolution between POI and nighttime light, and has higher accuracy and timeliness compared with the boundary of urban-rural fringe identified by nighttime light, population density and other data alone. 2) Compared with land use, landscape and other data, NPP&POI can better represent the vitality of urban and rural development. It can quantitatively identify the potential urban and rural central areas and multi-layer structures. This result has reference significance for the research of urban and rural infrastructure allocation, industrial division, ecological function division, etc. 3) The second mutation rule of NPP&POI in urban and rural space confirms that the urban-rural fringe exists objectively as a regional entity generated in the process of urban expansion, providing empirical support for the theory of urban-rural ternary structure.

     

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