利用增强型水体指数(EWI)和GIS去噪音技术提取半干旱地区水系信息的研究  

A Study on Information Extraction of Water System in Semi-arid Regions with the Enhanced Water Index(EWI) and GIS Based Noise Remove Techniques

作　　者：闫霈[1] 张友静[1] 张元[1] 

机构地区：[1]河海大学水文水资源及水利工程国家重点实验室,江苏南京210098

出　　处：《遥感信息》2007年第6期62-67,共6页Remote Sensing Information

摘　　要：准确提取流域水系信息是进行水资源开发利用的首要任务。利用NDWI和MNDWI提取半干旱地区水系,无法有效的区分水系内的半干涸河道与背景噪音。本文在分析半干旱地区水系与背景噪音反射特点的基础上,提出了增强型水体指数EWI(Enhanced Water Index),有效地区分了半干涸河道与背景噪音。在利用形状指数去噪音方法的基础上,使用GIS技术去除背景噪音,弥补了形状指数去噪音方法的缺陷,更好的去除了水系提取过程中混入的背景噪音。综合使用上述两种方法,可以快速、准确、简便地提取出半干旱地区的水系。为此类地区水资源的开发利用打下了基础。Information extraction of water system in basin is the first step of the development of water resources. NDWI and MNDWI can not distinguish the scmidry watercourse from the noise in semi-arid regions. An enhanced water index （EWI） has been proposed in this paper based on the spectral signatures of water system and background noise. The EWI can significantly distinguish the scmidry watercourse from the noise. GIS techniques of removing noise improved the traditional method with shape index and efficiently removed the noise. EWI and GIS techniques can extract the water system in semi-arid regions faster, accurately and simply.

关 键 词：EWI 半干旱地区 水系提取 GIS 去噪音技术 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]