县域城镇用地信息提取研究——以福建省长汀县为例

Urban Land Extraction Based on TM Imagery:A Case Study of Changting,Fujian Province

针对如何快速、准确地获取县域城镇用地的信息问题,该文以2010年的TM影像为数据源,以典型的山地城市福建省长汀县为研究区,比较和分析常用的城镇用地提取方法的优势和不足;借鉴分层分类法的思路,综合运用归一化植被指数结合地形调节植被指数、多波段谱间关系法结合改进型归一化水体指数、归一化裸土指数结合归一化不透水面指数,对长汀城镇用地进行提取,总体精度超过85%。分析表明该方法是一种可行有效的城镇用地提取方法。

To grasp the scope of urban land in the county level is significant for successfully carrying out the urban planning and guaranteeing the sustainable development of rural economy.This paper aims at quick and accurate acquisition of the urban land.The study area is located in Changting,a typical mountainous city of Fujian province,where the merits and drawbacks of some traditionally used urban land extraction methods were compared and analyzed.Inspired by the hierarchical classification method,this paper extracted the urban land of Changting county by using NDVI(Normalized Difference Vegetation Index)&TAVI(Topograpy Adjusted Vegetation Index),MNDWI(Modified Normalized Difference Water Index),NDSI(Normalized Difference Soil Index)&NDISI (Normalized Difference Impervious Surface Index)methods considering their merits,and the overall accuracy is 85%,which illustrates that the adopted method is useful and efficient for urban land extraction.