摘要
社会经济的高速发展带动了城市的空间扩展,引起了城市土地利用结构的变化。为了对城市建设用地和城市发展规模进行合理的调控,应该对城市的扩展进行动态监测。在城区扩展动态监测方面,遥感和地理信息系统已经得到了一定的应用。本研究以湖北省武汉市为例,利用2002年7月9日陆地卫星ETM+数据,在遥感和地理信息系统技术支持下,开展武汉市城区扩展的卫星遥感动态监测技术研究。利用NDVI指数确定区分植被区与非植被区的阈值,得到相应的城区范围。该方法的关键在于根据不同土地利用类型的NDVI直方图确定植被区与非植被区的阈值。研究结果表明,在影像间相同地物光谱特征差异较小,且在植被长势好的情况下,利用NDVI植被指数阈值法可以较好地对城区扩展进行动态监测。
As accelerating economic growth,rapid urban sprawl and dramatic change of land use structure became an important issue.In order to control the urban rational scale,it is necessary to monitor the urban sprawl in time.With the development of remote sensing（RS） and geographic information system（GIS）,RS and GIS techniques are applied more and more in urban land use change detection.Study area lies in Wuhan City,Hubei Province.On the basis of collecting and summarizing literatures,it is carried out monitoring of land use change by RS and GIS.The RS data we used is Landsat ETM＋ acquired at 2002.7.The study focused on the methods of urban sprawl dynamic detection.And it is important to determine the threshold by the histogram of NDVI.It is needed to confirm the area that is not covered by vegetation using the threshold of NDVI,and then extract the urban area boundary.Comparing the areas of image,the boundary of city can be recognized.
出处
《测绘与空间地理信息》
2011年第5期84-86,90,共4页
Geomatics & Spatial Information Technology
