Urban Expansion Analysis of Hefei City in the Last 30 Years by Using Romote Sensing
利用1981-2010年六期Landsat影像，分析了合肥市城市扩张的时空差异、驱动力及对生态环境的影响，发现城市扩张呈紧凑稳定到松散复杂的变化，热岛效应面积增加但强度减弱。
By using six images from Landsat MSS/TM/ETM + dates in 1981a,1989a,1995a,2000a,2005a and 2010a,combined with evaluation of urban expansion,Land Use/Land Coverage Change and urban heat island,we analysis spatial and temporal different characteristics in urban expansion of Hefei City,the driving forces and resultant impacts on ecological environment in the last 30 years.The results showed that during the period from 1989 to 1995,urban land-use expansion in Hefei City showed slow growth trend,the rest of the time were a period of rapid growth.The relationship between population growth and urban land-use in Hefei City is more reasonable,and the development of the city has been the strong support of the population.The development of urban land-use expansion is from compact and stable to loose and complex.Urban expansion by concentric expansion,the center of gravity is basically stable into a cluster expansion,the center of gravity is significantly transfer to south and west.Economic development,population growth,traffic traction and government decision are driving urban land-use expansion.Urban heat island effect in the area as increas as the urban expansion,but the intensity of the heat island showed weakening trend,the decrease in high temperature zone and very high temperature area,showing the trend of multi-center and film distribution.The occupation of the main type of land use is agricultural land in urban land-use expansion,the area decreased by 23.61% from 1995 to 2010.