山地高原地区TM影像水体信息提取方法比较——以香格里拉县部分地区为例  

Comparison of Water Extraction Methods in MountainousPlateau Region from TM Image

作　　者：陈华芳[1] 王金亮[1] 陈忠[2] 杨柳 席武俊[1] 

机构地区：[1]云南师范大学旅游与地理科学学院,云南昆明650092 [2]中国科学院青海盐湖研究所,青海西宁810008 [3]广东省东莞市规划局编研处,广东东莞523129

出　　处：《遥感技术与应用》2004年第6期479-484,共6页Remote Sensing Technology and Application

基　　金：云南省自然科学基金项目--基于3S技术的滇西北湿地资源开发利用与保护研究(2002D0036M);云南师范大学地图学与地理信息系统重点学科资助项目之一。

摘　　要：采用遥感数据对地物进行识别是获取地物信息的一种重要手段。在云南省香格里拉县湿地研究中,以Land-satETM+影像作数据源,分别采用了阈值法、差值法和阈值法的结合运用、多波段谱间关系法和阈值法的结合运用3种方法对湿地进行识别。结果表明:采用阈值法难以将灰度值接近的山体阴影和水体区分开来,差值法和阈值法的结合、多波段谱间关系法和阈值法的结合运用提取到的水体信息精度较高,多波段谱间关系法对于消除阴影的效果最好。The data of satellite remote sensing is a good Way to acquire information of the earth's surface.In the wetland research in Shangri-la county ,Yunnan Province, the water information extraction has been studied by analyzing spectral characters of Landsat ETM+ digital image and spectral models are established in the article.As the study area is one part of the plateau falling and rising in great distance,there exist quite a lot dark mountain shadow on the image that make it more difficult to extract water information.To do this,three methods are respectively applied to separate water information from background with landsat ETM+ digital image: threshold method, combination of difference and threshold method, combination of multispectral relation and threshold method. The results show that threshold method could hardly distinguish water from shadows ,because their spectral characters are alike on some bands,the water information extracted varies greatly according to different selected threshold.Water information extracted by combining difference and threshold method is more accurate, but some dark mountain shadows has also been extracted. Comparatively,spectral relation methods are more accurate by applying the principle that the water reflect green strongly and absorbs infrared strongly,a algrithm such as band2 +and3 and band4 + band5 can increase the difference between shadows and water, so combination of multispectral relation and threshold method eliminate the shadow effectively and extract water information accurately.

关 键 词：水体信息 阴影 光谱特征 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]