Abstract:
The population density distribution map with 500×500 grids is generated by the ArcGIS10.0 software based on the map of land use type and the resident population data of the sixth census data of Xi′an city. The resident population density contours is rendered to calculate the population scale of the alternative CBD or sub-CBD by measuring the areas which are enclosed by the contours. According to the definition and the economic characteristics of CBD and sub-CBD, the screening conditions are designed, and assisted with the coefficients of the urban population density models and the judgments by the authors, a general method to identify the number and location of the CBD and sub-CBD is proposed. Results show that there is only one CBD in Xi′an city (the CBD of Bell Tower), as well as five sub-CBDs (the sub-CBD of Xiaozhai, Xigaoxin, Zhangjiabao, Tumen and Fangzhicheng), and the numbers and positions of CBD and sub-CBDs are identified and labeled. The method can help to correct the bias of the coefficients of urban population density model, and also can be applied in the city designing as well as site selection in the commercial and the public service fields.
