Research on Dynamic Expansion of the Large Mountainous-City Based on Remote Sensing

Images of SPOT in 2000,2003 and CBERS-1 in 2006 as the data sources,have been used for this study.Based on a series of image pre-processing by using the technology of RS and GIS,urban built-up area of the central of Chongqing city was extracted,as well as the speed and the spatial-temporal features of urban expansion was analyzed.The results obtained show that,urban built-up area have increased 111.14 km2,10.48% of the annual growth rate during the 2000~2006 period.The north and northeast direction were the leading orientation of urban expansion,accounted for 60% of the total expansion area.The erosion of arable land is most prominent.The built-up area expansion and the spatial-temporal features were mainly attributed to the economic development,the proper policies of local governments and the urban planning,natural and geographical environment,as well as the development of traffic infrastructure.