Research on the Gravity Pattern Division of Chengdu City Circle Based on An Imporved Gravity Model.

By studying the gravity relationships among cities within the region, the economic relationships among cities can be explored, which is the basis for reasonably dividing the urban groups within the city circle and achieving the coordinated development. Based on the theory of urban gravity model, this paper introduces the theory of psychological distance and improves the urban gravity model based on the urban competitiveness and vector-based gravity model. Taking Chengdu city circle as an example, this paper expounds the current situation and economic connection of Chengdu city cycle's gravity pattern. The results show that the improved gravity model can objectively reflect the current conditions of relative gravity among cities. The city circle of Chengdu clearly presents the economic pattern of "overdominance". The urban competitiveness and gravity of Chengdu are far beyond the average level. The economic connection of the whole city is too scattered and the regional development is not balanced, which need to be improved in the future development. [ABSTRACT FROM AUTHOR]