芜湖市城市扩展的遥感监测及驱动力研究

Urban Spatial Expansion of Wuhu City Based on Remote Sensing Technology and Its Driving Forces

通过对芜湖市1979,1988和2001年的MSS/TM/ETM+遥感影像的动态监测,利用改进后的条件仿植被指数(NDBI)专题信息提取法与监督分类法相结合提取城市建成区空间信息。利用叠加分析法对芜湖市建成区不同时期城市扩展特征进行研究,表明城市扩展在时间上呈现扩展速度不断增加,空间上呈现扩展的方向性特征。分析了各个时期城市扩展模式,结合社会经济统计数据,得出城市扩展的主要驱动力是城市人口的增长和经济的发展,政府决策在宏观上影响着城市扩展的方向和强度的结论。

This paper extracts urban spatial information of Wuhu City based on Landsat MSS/TM/ETM ＋ images of 1979, 1988 and 2001 by dynamic observation of remote sensing technology. The methods included the improved conditioning normalized difference built-up index （NDBI） and the image supervised classification. The study of urban expansion on the build-up district of Wuhu City by overlay analysis shows that the expansion speed is faster gradually and urban expansion shows up at different directions. Further study is given on expansion model. The driving force of urban spatial expansion of Wuhu City is also calculated using the data acquired and other related information. The result indicates that the key driving force is economic developing and urban population＇ s growth, urban expansion directions and expansion force are determined by government＇ s macro-control.