Influence and driving force of administrative division adjustment on urban spatial expansion:a case study of withdrawal from city into district in Jiutai,Changchun City
Removing counties(cities)into districts is one of the main modes of administrative division adjustment,which has an impact on the urban spatial structure.Using multi-temporal remote sensing images of Changchun,administrative division vector graphics and statistical survey data of social and economic conditions,this paper analyzes the evolution of construction land and economic development in Changchun City before and after Jiutai was withdrawn from the city and divided into districts.Utilizing ENVI software,GIS technology,and other means,this paper revealed the impact of Jiutai's withdrawal from the city and the establishment as a district on the spatial expansion of Changchun City at the two-level spatial scale of Changchun City and Jiutai District.The research found that:1)Dismantling the city into districts accelerated the expansion process of Jiutai District,which further affected the direction and extent of urban spatial expansion in Changchun City.2)The decommissioning of the city into districts caused Jiutai and the main urban area of Changchun to converge towards each other,and the spatial distance between the two districts gradually narrowed.3)The"polarization effect"of the Jiutai District became more pronounced after the city was withdrawn and divided into districts,and high-density clusters appeared in the main urban area of Changchun.4)The division of counties(cities)into districts is an important driving force for urban spatial expansion,primarily reflected in three aspects:policy,industry,and land use.
turning counties(cities)into districtsurban space expansiondriving forceChangchun CityJiutai District
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