The Study On The Method Of Extracting The Central Urban Area In Lanzhou

Since the reform and opening up to the outside world, Lanzhou City urban development speed increased, the improvement of the degree of the city promotes the Lanzhou city of material economy rapid development, rich in material resources is bound to caused by large numbers of people to urban influx. So,population of Lanzhou City, especially downtown Lanzhou populations showed a high growth momentum of development. At the same time,because of restrictions on Valley City of unique terrain factors, Lanzhou City Urban Construction land has showed a decreasing trend and this vicious circle of urban development situation need to get rid of. The population density is too high to the center of the city caused by traffic congestion, environmental pollution, building density is too large, the serious shortage of urban public space, the center city green resources extremely deficient "urban disease", making center of Lanzhou city is like a dilapidated old machine, has seriously hindered the healthy development of the whole city. In addition to Lanzhou’s narrow "two mountains and one river" banded terrain, so this industrial city has embarrassed the burden.For exploring ways to fundamentally solve downtown Lanzhou urban problems in a variety of ways, this paper from shallow to deep launched a discussion in view of the above problems exploration, by reading a lot of literatures, collects a large number of relevant data,combined with the relevant planning, get the conclusion. The first two chapters mainly discusses the relevant concepts, theoretical explanation and content for, to the conclusion the method is put forward to provide theoretical and practical basis, for the convenience of the various strategies and methods of data in order to predict the results provide realistic basis and basis for the implementation of, enhance the credibility. The three or four chapter mainly analyzes the distribution status of Lanzhou city population, city function, the existing planning is analyzed, and the combination of population prediction method and the function of the city distribution related programming, finally summarizes the conclusion strategies and solutions for the current problems, namely reference revised in 2011 "city land classification standard and related standard" planning and construction, through the comprehensive growth rate method, regression analysis method, the element prediction method, space capacity checking method, using the concept of "city groups division", of Lanzhou city will be divided into three levels of ease group, namely the core control area, adjust and improve the development area, construction area, each group includes relief groups division city master plan, so that the layers division structure The mode of management greatly simplifies the structure of the city to a certain extent, which is convenient for the management of the city.Finally, according to the data prediction method, draw Lanzhou City from three city ease group of, gradually layer by layer will ease out center city population and functions, and alsocalculated the cities each ease group within the group need to ease the population and functions and specific data on population and function, finally, the uniform data to specific tables and charts, you can clearly see the final pumping sparse results, make the final conclusions of the study data support and operability.