Cellular Automata (CA) has attracted growing attention in urban simulation because their capability in spatial modelling is not fully developed in GIS. A "bottom-up" model is proposed for simulating complex urban system based on the integration of extended cellular automata (ECA) and geographic information system (GIS). The entity framework of the model is established for multi-scale land use changes and urban growth. The model has been successfully applied to the simulation of three urban areas at different scales: Pudong New District,Lujiazui Finance & Trade Zone and Sanlin Town in Shanghai, China.
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