基于光谱混合分析法的苏州城市扩张过程研究

Research on the Process of Urban Expansion In Suzhou City Based on Spectral Mixture Analysis

城市化的一个重要表现就是不透水面的增加,对于规模较大的大城市,利用遥感影像来获取不透水面的分布,进而分析城市扩张过程是当前国际研究的一个热点。采用光谱混合分析(SMA)方法研究苏州市1995-2010年间苏州市城市扩张过程,选择1995、2000、2005和2010年四期Landsat TM/ETM+遥感影像,提取苏州市不透水面丰度分布信息进而得到不透水面面积,通过比较分析城市扩张过程。研究结果表明,苏州市1995-2010年间城市扩张显著呈现从城市中心向四周环形扩张的趋势,扩张的范围随着经济的快速发展而逐渐增大,且城市的中心区域由于社区成熟较早,不透水面丰度变化不大接近于1,从城市中心向外扩展不透水面丰度值逐渐减小,城市不透水面面积呈逐年增加趋势。

An important manifestation of urbanization is the increase in the impervious surface.For large cities,remote sensing images are used to obtain the distribution of the impervious surface.Spectral mixture analysis（SMA）method is used to study the process of urban expansion in Suzhou from 2010 to 1995,1995,2000,2005,2010,four Landsat TM/ETM＋ remote sensing image are selected to extract the information of the distribution of the impervious surface in Suzhou City,and to get the impervious surface area,the urban expansion process is analyzed.The results show that,Suzhou City from 1995 to 2010,urban expansion from the city center to a significant expansion of the surrounding ring,the expansion of the scope of the rapid development of the economy and gradually increases,because the central area of the city is the maturity of the community,and is close to 1.From the city center,the expansion of the surface area of the city gradually decreased,and the impervious surface area of the city increases year after year.