Study On Spatiotemporal Distribution Of Population In Hefei City Based On Big Data And Spatial Syntax

At present,with the acceleration of urbanization,urban space is facing restructuring and combination,and its complexity and scale are also increasing day by day.As population is an important component of urban space and the most active factor in socio-economic development,studying the spatial and temporal distribution of population has become one of the hot topics and focus topics in urban planning research.At the same time,the urban spatial structure is also the focus of urban and regional planning research.It not only delves into the evolution of the size of the city,but also deeply studies the characteristics of the population and socioeconomic activities within the city.Therefore,the urban population behavioral activities and spatial and temporal distribution characteristics reflect the city’s internal structure from the side.In the current booming prospects of big data technology,looking for suitable big data tools to study the spatiotemporal evolution characteristics of the rapidly developing and changing urban population has important significance and realistic requirements for revealing the urban spatial characteristics and changes of urban structure in China.This article takes Hefei as the research object,and uses the Baidu map heat map in the first week of each month in the downtown area of Hefei from February 2019 to January 2020,the urban road network of Hefei in 2019,and the POI of Gaode map in 2019 as data Based on each administrative division as the smallest research unit,using GIS spatial analysis technology and quantitative geography methods,systematically analyzed the current and spatio-temporal characteristics of the population distribution of Hefei City,and revealed the spatial pattern of the population distribution of each administrative division of Hefei City,namely The indicators of heat intensity,global integration,local integration,and nuclear density are used to analyze the characteristics of the spatial and temporal evolution of population in Hefei within one year.Specifically,the spatial distribution of population in Hefei City is characterized by "one mind".The population distribution is mainly concentrated around the old city,and the high-density areas of the population are mostly distributed within the Second Ring Road,along with subway lines and Jinzhai Road.Main line layout.In addition,the time distribution of population in Hefei City shows different changes on working days,non-working days,seasons,and months,and the daily population distribution has relatively fixed peak periods and trough periods.Secondly,the spatial syntactic integration index is selected to divide the accessibility area of Hefei City and the heat intensity to divide the population agglomeration area for coupling comparison.The three population density areas of high,middle and low in Hefei City are divided,and then the POI data is coupled to the spatial distribution of the population of Hefei City.As a result,we further explored the influence mechanism,deeply explored the evolution law of the spatial distribution of population in Hefei City,and concluded that POI facilities are highly correlated with the population layout,and proposed an orderly distribution of population for each sub-area,so as to provide a city center for Hefei.The reasonable population distribution and sustainable development of urban areas provide planning and decision-making basis,which helps to formulate scientific and rational urban planning,and at the same time provide theoretical reference for second-tier cities of the same type and developing rapidly.