Identification And Analysis Of Urban Employment Center In The Central City Of Xi’an

Urban employment center plays an important role in the spatial structure of urban development.The spatial distribution characteristics of its jobs reflect the industrial spatial structure of urban development,and the employment population it carries is an important indicator of the development vitality of a city and a region.Urban employment center affects the configuration of urban infrastructure,public service facilities,road traffic system and many other systems.Studying its spatial clustering and layout characteristics can help us to better understand the law of urban development,so as to further guide the rational layout of urban spatial structure.The research object of this paper,Xi’an,is in the stage of high-speed development,with rapid expansion of urban skeleton.A reasonable layout of urban employment center is particularly important for the improvement of the comprehensive development level of Xi’an.Therefore,it is of great significance for the overall development of Xi’an to effectively identify the distribution characteristics of the existing employment centers in the central city of Xi’an and the matching relationship between the urban functions of the employment centers.In the existing research literature,the identification of urban employment center is mostly based on the verified identification and positioning of the urban employment center determined by the development planning over the years,and due to the deviation between the actual situation of urban development and the planning,the conclusions drawn are lack of timeliness and accuracy.This does not match the important position of the employment in Xi’an,which is developing rapidly.On the basis of qualitative research,it is very important to make a quantitative judgment on the employment center of the central city and Study on the function mixing degree for the further improvement and construction of the employment center of the central city of Xi’an.Therefore,this paper uses correlation clustering algorithm to identify the space and scale quantitatively: first,DBSCAN algorithm based on the density,which uses the city POI data as the data set input to identify the clustering of jobs with different functions;second,K-means algorithm,which effectively classifies the employment center of the central city of Xi’an;third,spatial entropy algorithm,which is used to identify The other urban employment centers carry out the research on their internal functional diversity and mixing degree.Through the identification and analysis of the above three model algorithms one by one,this paper draws the following conclusions:(1)The overall distribution of urban employment centers in the central city of Xi’an is concentrated in the south,and there is a trend of distribution along the rail transit station line.In the North-South distribution,it is obvious along the central axis of Weiyang road and Chang’an Road,and the East-West distribution is mainly along the South Second Ring Road;(2)Through the identification of the functional diversity characteristics of the employment center,Xi’an’s large-scale and functional diversity of urban employment centers are mainly based on the functions of commercial service industry,which is mainly based on the functions of catering industry and shopping industry;(3)Through the identification and analysis of the relationship between occupation and residence in the urban employment center area,it is found that the high-level urban employment centers are mostly distributed in the areas with larger entropy index of urban employment and residence space,but the lower the balance index of occupation and residence,the closer the relationship between the index and the functional diversity index of the area.However,in the areas with unbalanced working and living conditions,the greater the current situation of working and living brings greater commuter pressure;(4)Through the effective division of the level of the employment center,the distribution structure of the urban employment center is presented as "three main parts and more auxiliary parts".The spatial distribution of the three main centers of Zhonggulou dachaoshi District,Xiaozhai DaYanTa district and Nanmen Nanshaomen district also shows the trend of the center of the urban area of the Ming Dynasty going south along Chang’an Road.In addition,the employment centers with large scale level index and functional diversity index are mostly in the form of continuous areas in urban development,which can effectively promote the positive interaction and efficient integration of different functional jobs in the area.