A Research On The Simulating And Optimizing Of Urban Spatial Form Based On The Cellular Automation

Urban spatial form studies the state and form of urban evolution and its related factors from the perspective of space. Since the reform and opening up, with the rapid development of national economy,cities in china have entered a period of rapid development,as a direct result of the urbanization development, urban spatial form has also undergone dramatic changes.The evolution of urban spatial form is very complicated, as a discrete System dynamics model both in time and space, cellular automaton reflects the essence of "Simple subsystems can be combined with each other to form a complex giant system", particularly applicable to the simulation of the geographic systems with complex time and spatial characteristics, and it has become an important tool to study urban spatial form.Based on the summaries of relevant domestic and foreign studies, the article analyzes the relevant concepts and theoretical basis of urban spatial form based on cellular automaton (CA) in detail, Focus on the angle of the use of cellular automaton in urban applications and extension studies, using remote sensing (RS), geographic information systems (GIS) data platform, spatial analysis as the major research tools to study the Changsha urban spatial form empirically and analyze its evolution trajectory and mechanisms. Then extend the standard CA model from the view of urban planning by introducing the overall development of probability and unit development suitability, Mining cellular transformation rules based on the logistic regression methods to build urban spatial form growth model, simulating the urban spatial form in Changsha City empirically and predict the urban development patterns in the future. At last, increase development density and urban form factor based on the model to build the optimization module of urban spatial form and find out a relatively reasonable urban spatial form of Changsha in the future by setting the urban development programs in different circumstances and comparative analysis.The results show that: according to the existing city development trends, the city construction land will become more tense and the ecological environment will get less effective protection, and Changsha should adopt a sustainable development program of "high-density multi-center/slow decay" in the optimization module.