Research On Urban Spatial Structure Of The Central Area In Lanzhou Based On POI Data

Urban spatial structure is one of the main contents of the research on urban geography.The large-scale and rapid development of cities has led to the emergence of lots of urban problems such as environment,transportation,occupation and housing.Therefore,optimizing the urban spatial structure and promoting the sustainable and healthy development of the city have become the key direction of the urban planning.At the same time,with the rapid development of information technology,the data sources of urban research have also been innovated.This paper takes the central urban area of Lanzhou City as the research area,and analyzes the spatial agglomeration-discrete distribution characteristics of the overall economic and geographical elements,the spatial distribution characteristics of the factors of each industry,the characteristics and optimization of the overall spatial structure of the city,using the Nearest Neighbor Index,Kernel Density,Location Entropy.The conclusions are follows:(1)The overall distribution of the urban economic and geographical elements is centralized in the center.The spatial distribution center of various economic and geographical elements in the central urban area of Lanzhou city is characterized by remarkable gathering characteristics,large-scale aggregation centers exist in many industrial elements such as urban retail,real estate,education,leisure and entertainment and medical treatment,and specialized functional areas are formed.In particular,there is obvious "center-periphery" difference distribution in the space,the third industry is distributed in the central area,the second industry is distributed in the peripheral periphery area,and the structure of the ring layer is obvious.(2)The urban space is the strip-shaped urban spatial structure which has strong main center,weak secondary centers and multi-cluster continuous.The multi-center distribution of the urban spatial form in Lanzhou reflects the structural pattern of strong main center,weak sub-center and multi-peripheral group,and there are four major urban centers.The main center is the core area of the Chengguan,and the three sub-centers are the core areas of the Qilihe,Anning and Xigu.The development of the center in Xigu is mature,but the scale is smaller,the energy level is lower in the multi-center system of the city.The development of the Anning-Qilihe central system in the planning is not mature,which is in a weak position in the urban multi-center system,but the development potential is huge.At present,the overall space of the city is transition from the multi-center structure with the large energy level difference to the multi-center structure of balanced development,and the marginal layout of some functional elements is obvious.(3)Improving the compound degree of urban functional space is an important goal of spatial structure optimization.The most direct embodiment of improving the compound degree of urban functional space in the economic and geographical entity is to comprehensively and effectively lay out the various industry elements.It is necessary to perfect the supporting system of all kinds of Service elements,strengthen the guidance of traffic network to urban functional space,reduce commuting pressure of residents and strengthen the links among different regions of the city.And it will show that the optimized urban spatial structure plays an important role in the sustainable development of the city.