| To a certain extent,the spatial distribution of urban commerce represents the overall spatial pattern of the city.It is of great significance to master the spatial distribution characteristics of urban commerce for urban planning,commercial space development and government regulation.As the first special economic zone in China,Shenzhen has become a cosmopolitan city with considerable influence in just 40 years,and is a representative of the rapid development of our cities.Based on the Gode POI data of Shenzhen in 2015,2017 and 2019,this paper studies the spatial structure of its business and the internal relationship between various business formats.The main research contents and conclusions are as follows:(1)Collect data and explore analytical methodsThe POI data of Shenzhen city is obtained year by year by calling the Godemap API through python programming.The vector map data of Shenzhen city is downloaded from Open Street Map,and the two are integrated through coordinate transformation to further realize the cleaning of cross-border POI data.This paper explores the main analysis method,selects kernel density algorithm and standard deviation ellipse algorithm to analyze the spatial distribution characteristics and change trend of business,and then selects geographic detector to analyze the internal relationship between various types of business.(2)Spatial distribution of Commerce in ShenzhenStatistics of the number of various types of commercial POI in the lower administrative regions of Shenzhen in 2015,2017 and 2019,and drawing radar map for comparative analysis;using the method of nuclear density estimation,to identify the distribution and spatial aggregation degree of Shenzhen’s overall and various(ten type)commercial outlets;to explore the development of Shenzhen’s overall and various(ten type)commerce by using the standard deviation ellipse analysis method The trend of time and space change.The experiment shows that the commercial points in Shenzhen are distributed along the traffic line in space,and basically gather in the "three axis,two belts" area,with an increasing number year by year,showing the distribution pattern of "core + axis";in time,the distribution mode has not changed significantly,but the commercial agglomeration center is moving slowly to the East,and it is a diffusion trend.(3)Correlation analysis of business typesThe research area is divided by Tyson polygon and 600 m * 600 m regular grid with each community neighborhood committee as the control point.The divided research area is connected with POI data spatially.Taking the change value of various commercial formats after standardization as the independent variable,the Geodetector and SPSS software are used to detect the impact of various commercial formats on the overall commercial changes in 2015-2017 and 2017-2019 And the correlation analysis between various types of business.The results show that in 2015-2019,daily small-scale businesses such as living,shopping and catering play a leading role in the overall business development of Shenzhen,while large-scale businesses such as accommodation,company and enterprise,business and residential have no significant influence.There is a positive correlation between the various formats,but the degree of correlation is different,and the degree of correlation is affected by external factors,which has a certain change in the time dimension.From 2015 to 2017,the basic service formats such as catering service,health care service and life service have high correlation,while other formats have low correlation.From 2017 to 2019,in addition to the high correlation among life services,catering services and health care services,sports leisure services and life services,shopping services and life services are also highly correlated. |
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