Research on the Spatial and Temporal Evolution of Urban Structure Based on POI Data and Nighttime Light Data:A Case Study of Fuzhou City
Based on the advantages of authenticity and intuitiveness in reflecting urban spatial structures using points of interest(POI)and nighttime light data,this article explores the spatial and temporal changes in the urban spatial structure of Fuzhou city using POI and nighttime light data from the years 2018,2020,and 2021.The article also analyzes the reasons behind these changes.The results indicate that:(1)The overall urban structure of Fuzhou city is a single-center structure,expanding towards the eastern coastal areas.The development focus is strong in the central region,weaker in the west,and shows a significant strengthening trend in the east.(2)The relationship between coupled areas and regional economic development levels and land use types is closely related.High-high,high-medium,medium-high coupled areas are mainly distributed in the city center.High-low coupled areas are found in airports,ports,industrial parks.Middle-middle coupled areas are distributed in the transition area from the city to the suburbs,while medium-low,low-medium,and low-low coupled areas are located in the economically underdeveloped suburban outskirts of the city.(3)From 2018 to 2021,the overall area of regions with the same coupling of nighttime light and POI kernel density has increased,particularly in high-high and low-low coupled areas.Between 2018 and 2020,the area of high-high,high-medium,and high-low coupled areas increased significantly,while medium-high coupled areas decreased.However,from 2020 to 2021,the high-high,high-medium,and high-low coupled areas decreased,and medium-high coupled areas increased.(4)The changes in the urban spatial structure of Fuzhou city are the result of the combined effects of economic,political,population,and urban planning factors.
nighttime lightPOIurban structurecoupling analysisFuzhou city
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