Studies On The Simulation Of City Spatial Extension And Landscape Optimization Based On CA Model

With the rapid development of today’s growing urbanization, urban land utilizationdynamic simulation and visualization research has become a hot issue of the city dynamicchanges of. In order to understand the development of urbanization in Hefei, by usingCellular Automata(CA) as the theoretical basis and remote sensing data as the source,through the coupling of Geographic Information System (GIS) and simulation software(GeoCA-Urban) conducted a visual simulation and prediction of the dynamic expansion ofthe zones which three are the rapid development of Gaoxin zone, Jinkai zone and Binhuzone in Hefei. The significance of the regional predicted modeling experimental lies notonly predicted the possible direction and trend of Hefei’s development in the future, butalso by the comprehensive analysis of analog data statistics and landscape pattern to therapid development in Hefei, proposed a four-point Landscape Construction as problemsthat need attention for future planning and development of Hefei in the future providedecision and support.This article from the theory, based on details of the complex two-dimensional cellularautomata modeling foundation, proposed a new type of three-dimensional modeling ofcellular neighborhood. Because it can not only make the process more intuitive simulation,but also increased in the simulation influence factors and the layer of controlling factorswhich will enhance the authenticity of the simulation results. But by the computerconfiguration, data collection difficulties and many other factors, the simulation used inthis article is still the traditional two-dimensional modeling neighborhood. The study of thespecific content and conclusions are as follows:(1)By land use classification on Hefei, the model required for each layer the sameresolution processing determine Hefei dimensional cellular automata simulation of scalegranularity is30m.completing the data processing based on the synthesis of the land uselayer, traffic layer and the layer of controlling factors.(2) Establish the simulation model in GeoCA-Urban software when2002as the baseyear,2010as the target year, then determining the simulation parameters by Lee-Salleeindex and correcting the simulation model on2010by correlation coefficient. Thecorrected2010model forecast the simulation model on2018. The simulation results showthat: If Hefei is still in the2002-2010trend, urban land will further expansion, housing andcommercial land growth continuously,the industrial land expansion trend will weaken. (3)Using simulation’ quantitative and visualization results and the changes of Hefeilandscape pattern index in2002-2010obtained the different characteristics in the threeresearch areas. From the the data analysis we can see that these three areas are all rapiddeveloping, but their development characteristics are different. Industrial land is the mainland in Gaoxin zone, housing and commercial land development speed is general, and thestock land close to saturation; Jingkai zone is the stablest area in the three areas, the stockof land is generally; the housing land proportion is highest in Binhu zone, the stock landand development potential is largest too.（4）Simulation results show that Hefei will maintain the trend of rapid expansion inthe next five years, and Binhu zone is the fastest expansion region. With the built-up areain Hefei and the rapid increase of population, the ecological environment has been affecton the heat island, garbage and the urban road congestion problems.According to thecharacteristics of different research areas to make different land management policies andmeasures in order to provide a theoretical basis to make Hefei as a beautiful environment,good ecology and modern city.