桂林市主城区建设用地扩张时空动态特征分析

Analysis on the Temporal-Spatial Feature of Construction Land in Guilin Urban Areas

以快速城市化的桂林市主城区为案例,利用Landsat系列遥感影像数据源,通过构建归一化植被指数(NDVI)、归一化建筑指数(NDBI)和修正归一化水体指数(NDWI),并对这3个指数波段进行假彩色合成;运用最大似然监督分类法分别提取1991—2013年3期建设用地信息,借助ARCGIS工具对城市建设用地空间分布与扩展特征进行系统分析,结果表明:桂林市城市化扩展进程日益加快,主城区建设用地面积和扩展强度指数均呈增大趋势。不论从城市建设用地总体空间格局,还是从各个城区、城市方位、缓冲区以及地形条件等角度分析,城市后期(2006—2013年)的建设用地扩展明显快于前期(1991—2005年)。目前,随着桂林市城市化的不断推进,城乡过渡地带的高新技术产业园区、工业园区以及南部远郊区的雁山大学城和卫星城镇,都已成为城市建设用地扩张的热点区域。

Taking the acceleating urbanized Guilin city as an example,and using Landsat images as data sources,three indexes were constructed which were normalized different vegetation index（NDVI）,normalized different built-up index（NDBI）and normalized different water index（NDWI）.The information of construction land from 1991 to 2013 was extracted by false color composite and supervised classification method.In addition,the spatial-temporal feature of construction land in Guilin City during the 22 years was analyzed by using ARCGIS software.The results showed that the construction land areas and expansion intensity index of Guilin City increased distinctly with the development of urbanization.Whether from the spatial relationship of construction land angle,different districts,direction,the buffer or topographical conditions angle.The construction land expansion of the later period（2006-2013）is faster than those of earlier period（1991-2006）. With the continuous development of urbanization,the construction land expansion of high-tech industrial zone and industrial park in the suburbs,Yanshan university town and satellite towns in the outer-suburbs have become hot spots.