Research On The Spatial Relationship Between Work And Residence In Xi’an Based On Multi Source Big Data

With the rapid development of Xi’an city economy and society,the urban functions,population structure and residents’ living mode are also developing in a diversified way.The former unit courtyard style or nearby living and working mode is difficult to meet the needs of urban residents’ daily life.People’s living and working space begins to cross the streets,administrative areas and even administrative boundaries,and the phenomenon of separation of duty and residence is becoming more and more obvious.With frequent long-distance commuting,air pollution,traffic congestion and other problems have gradually become an important problem that has troubled the development of the whole society.Therefore,it is of great significance to identify the spatial distribution of Xi’an city and analyze the problems existing in the urban space.There are two kinds of research ideas in the existing research literature,namely,qualitative analysis and quantitative analysis.The quantitative analysis can be divided into two types: using traditional survey data and using big data.Traditional survey data or questionnaire survey methods take a large amount of time and sample size is small,and the data is static data;while the large data sample size can record the spatial and temporal data of population activities on a large scale,thus reflecting the shift of the job and living space.The research based on big data can describe the spatial relationship of Urban Vocational and residential more accurately.This paper will use mobile phone signaling data to analyze the spatial balance of the office and residence in Xi’an city.There are three methods: first,using the evaluation of the service distance between the office and the residence,the paper analyzes the employment Commute Distance and the residential Commute Distance respectively,analyzes the abnormal points,and then determines the areas where the job residence does not match;secondly,the employment and residence number are used to analyze the employment residence ratio index of Xi’an city Third,the distribution characteristics of the self-sufficiency of the street in Xi’an are analyzed by using the "job housing balance index" by using the local employment and residential population of each street.The three methods are used to identify the areas that do not match the jobs and residences in Xi’an.On this basis,the distribution characteristics of employment center and land use mix degree in Xi’an city are analyzed by using mobile phone signaling data and land use data.The paper further analyzes the influence mechanism of urban spatial structure on the balance of Vocational and residential,and puts forward some suggestions for the optimization of the areas that do not match the occupation and residence from the perspective of urban planning.The following conclusions are drawn in this paper:(1)The characteristics of the job and housing balance in Xi’an are: overall balance and partial imbalance.The area of balance of occupation and residence is the central area of the city wall;the areas with mismatched employment function are mainly located near the Third Ring Road and some areas on the edge of the city;the areas with mismatched residential functions are located in the streets near the Third Ring Road in the south,mainly the high-tech Development Zone;the areas that need to increase employment function and improve the living conditions are mainly Seoul street and Dizhai street.(2)The spatial structure of Xi’an city is characterized by single center system and sector division.The first level employment center is Zhonglou,hi tech and Xiaozhai,and the second level employment center is nanhaomen,Nanmen,Jiefang Road and auspicious Village.The employment centers are concentrated in the city center and the south of the city,which is close and uneven in distribution.There are obvious areas near the three ring roads in all directions of the city.The power range of each employment center is sector radiated from itself.Because of the distance,the competition is serious.The land use mix degree is low in the whole,high in the South and low in the north,high in the West and low in the East.The land use mix in the densely populated areas is basically high,while the mixing degree is basically low.(4)The impact mechanism of urban spatial structure on the balance of employment and housing: the employment center system has a great impact on the balance of job and residence,while the function attribute of the employment center intensive area is employment,while the other is partial to residence.Because of the single center characteristics of the employment center,the imbalance between the employment center intensive area and the lack of employment center is the most serious.The streets with residential properties as the main part can effectively reduce Commute Distance and improve the balance of work and residence.For streets with employment attribute as the main part,the effect of improving land mix is not significant,but scattered employment position can effectively reduce commuting distance and improve the balance of work and residence.