基于光谱夹角的水体信息提取方法研究  

THE EXTRACTION OF WATERBODY INFORMATION BASED ON THE SPECTRAL ANGLE

作　　者：姜腾龙[1] 赵书河[1] 肖鹏峰[1] 陈淑兴[1] 

机构地区：[1]南京大学地理信息科学系,南京210093

出　　处：《国土资源遥感》2009年第2期102-105,共4页Remote Sensing for Land & Resources

基　　金：由国家自然科学基金项目"高分辨率遥感数据决策级融合方法研究"(40501047);国家科技基础性工作专项"中国湖泊水质;水量和生物资源调查"(2006FY110600)共同资助

摘　　要：以南京幅Landsat ETM+数据(波段1～5、7)为信息源,通过分析不同地物的光谱特征,利用地物光谱夹角及反射率差异对水体信息进行提取.首先,求出ETM+6个波段形成的4个光谱夹角(波段2～5); 然后,利用各地物在波段4的光谱夹角值差异,区分水体、植被及阴影信息; 最后,利用波段4和波段5的反射率差异提取居民区信息 .The waterbody information extraction method based on the spectral angle is proposed in this paper.Nanjing was chosen as the study area and the Landsat ETM+ image(band 1～5,7) was regarded as the test data.The acquisition date of the image was July 17,2001 and the size of the image was 2048 columns by 2048 rows pixels.The spectral characteristics of different ground objects in different bands were analyzed and four spectral angles(band 2～5) were calculated.Then the vegetation was separated using the differences of spectral angles in band 4.The result of the separation of water information from shade was also quite well.Finally,the residential area was separated easily using the differences of reflectance in band 4 and band 5.

关 键 词：光谱夹角 水体 阴影 居民区 ETM+ 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]