Abstract:

Based on multitemporal Landsat TM and ETM satellite images，with the help of GIS software，the article extracted the construction land information of Taizhou City and analyzed the expansion and evolution law of construction land by using expansion index and spatial autocorrelation index during the years from 1988 to 2008.The results show the expansion of construction land in Taizhou has experienced three stages from slow increase，then a rapid rise to a sharp decline.It indicates that the expansion of construction land towards the trend of intensive utilization gradually.By analysing the process of construction land expansion，based on the different features of the various stages of construction land expansion，the article found that the expansion model was changing from point of expansion to interaxis of expansion and the emergence of network expansion clues.By spatial autocorrelation analysis of the expansion of hot spots，it found that expansion of hot spots showed the characteristics of migration，and that hot zones and cold zones changed mutually.Moran scatterplot reflects that the construction land expansion is on the state of space polarization，and that center towns of city prompt the expansion of peripheral towns.〖