元胞自动机(Cellular Automata,CA)是一种"自下而上"的动态模拟建模框架,具有模拟复杂系统时空演化过程的能力。CA模型的这些特点使得它在城市增长、扩展和土地利用演化模拟等方面较为合适,成为CA应用的热点。探讨利用GIS技术开发CA模型将会改善CA模拟城市扩展的环境,建立典型的城市CA模型也会发现新的参数和转换规则。基于CA原理,结合GIS与RS技术,在ArcGIS平台中进行二次开发,构建了GIS-CA模型系统。以洛阳市为研究区域,对其城市扩展进行了模拟和预测,结果表明,将人为的规划因素加入到CA模型中,打破了CA模型只能模拟城市受自然因素影响而进行的扩展。模拟结果比较真实可信,也为下一步城市规划提供决策支持。
Cellular automata(CA) is a kind of dynamically modeling framework from bottom to top and possess the capability of modeling spatial-temporal evolvement process of a complicated geographical system.The peculiarities of CA are apt for simulation in urban sprawl,expand and land use evolution,and the use in these respects becomes the hot of the application of CA.The environment of CA simulation can be improved by discussing using the CA model integrated with GIS to simulate urban sprawl,and new parameters and transition rules can be dig out by establishing typical urban CA.On the basis of the principle of CA,integrated with GIS and RS,in the second development of ARCGIS,the GIS-CA model is constructed,and the urban sprawl is simulated and forecasted in the case study of Luoyang City.The results of simulation indicates that the states that the CA model can simulate the urban sprawl by natural expansion factors is broke when man-made factors are added to the CA planning model.