中文摘要：

利用光谱混合分析（SMA）方法研究沈阳市1992-2007年间城市扩张过程,选择1992、2001、2007年各一景Landsat TM/ETM＋遥感影像,基于SMA模型获得不同年份城市不透水面（ISA,Imperious surface area）分布,将城市空间划分为四个方向（西北、东北、西南、东南）,利用不同年份ISA差值结果分析城市扩张过程。研究结果表明,在城市扩张过程中低值ISAchange面积大于高值ISAchange面积,即城市发展是一个渐进的过程。1992-2001年间,沈阳市城市扩张主要向西北、东北和西南方向;2001-2007年间,沈阳市城市扩张主要向东北和西南方向;1992-2007年间,沈阳市整体上向西北、东北和西南方向扩张,东南方向扩张较小。随着社会的发展,沈阳市城市化进程不断加快。

英文摘要：

This paper studied urban expansion process of Shenyang in 1992—2007 based on SMA. The authors Chose three scenes of Landsat TM /ETM ＋ images dated in 1992,2001,2007,and obtained urban impervious surfaces （ISA） based on SMA. The expansion of urban space was divided into four directions （Northwest,Northeast,Southwest,Southeast）. We analyzed the urban expansion process using the difference of ISA results of different years. The results showed that ISAchange area of low value was always larger than that of high value in the urban expansion process,it means the urban development is a gradual process; urban sprawl direction of Shenyang was mainly to the northwest,northeast and southwest between 1992—2001,to the northeast and southwest direction between 2001—2007, and to the northwest,northeast and southwest between 1992—2007. The development of society has accelerated the urbanization process of Shenyang.