Evaluation Of Economic Development Differences Of Chengdu City Based On The Action Of Spatial Field

With the putting forward of new-type urbanization of the 13 th Five-Year Plan Outline,the Urban-rural integration development emerges at a historic moment which propose new requirement of the layout of urban spatial structure.Take the central city as the core and make full use of its resource polarization and radiation diffusion effect;take the sub-town as the economic hinterland and give full play to its link between the roles;take the surrounding township as a node and fully tap its service functions and economic potential.At present,with the China's urbanization development speeding up,a series of problems have come out,such as the outstanding of urban economic polarization phenomenon,remote urban economic lays behind,urban scale expanses disorderly and so on.These prominent contradictions further hinder the coordinated development of regional economy.In order to solve this series of outstanding problems and contradictions,this paper studies the relationship between urban spatial structure,economic development and the sustainable development of urban and rural areas under the new urbanization background from a new research perspective-the action of spatial field.Geographic information science applied to the reality,for the urban economic development and spatial layout provides a new perspective,with a certain significance and theoretical value.This assay takes Chengdu City of Sichuan Province as the research district and uses the action of urban spatial field model to analyze and evaluate the differences between development of regional economy in Chengdu combined the spatial analysis technology of Arc GIS,the action of spatial field theory and the fractal theory.Based on the analysis of urban nodular index and reachability in Chengdu,this paper explores the radiation intensity of the central urban area as the core surrounding area and the inheritance of the ties between the towns and villages in the surrounding areas and describes the potential energy of each town affected by the surrounding.The following conclusions are drawn from the above studies:(1)To study the urban spatial structure of Chengdu,we can use the knowledge of the principle of spatial statistics and the fractal theory to describe the spatial correlation structure and the urban scale layout.The spatial clustering model of Chengdu is analyzed by using the Nearest Neighbor Index Module in ArcGIS,and the degree of agglomeration is generally the same as that of the central urban area.The concentration of the central city is the highest,and the concentration of Jintang County is the lowest.This trend of change and the trend of industrial structure in Chengdu showed a consistent trend,mainly from the tertiary industry to the primary industry,the level of urbanization is decreasing and the level of agriculture is on the rise.(2)According to the nodular index and accessibility,we can construct the action of spatial field model.The analytic hierarchy process and the GIS spatial analysis method are used to calculate the intensity of the regional economic development and the influence on the surrounding counties.According to the spatial distribution of the regional economic development,we can combine with the actual situation of the district to give the views of economic restructuring of the district and county,and put forward the plan of spatial layout optimization.In this paper,the spatial structure of Chengdu is characterized as: the central city as the core,the district and county resident in the second lap city and the third lap of city as the hinterland,the surrounding towns as the object of service;the traffic network as the channel,thus forming a "central city-secondary town-outer town" of the three city system.Using the spatial analysis technology of ArcGIS,the statistical analysis of SPSS,the analytic hierarchy process and the fractal theory,it is helpful to grasp the urban spatial context and understand the urban spatial relations.Taking Chengdu as a case,it has certain reference significance to other cities in Sichuan Province,which can help its urban planning and construction to be more reasonable,and the layout of urban space to be more optimized,which provides a scientific theoretical basis for the construction of new urbanization.