摘要
东喜马拉雅南迦巴瓦峰地区地形起伏大,单一的水体谱间关系模型容易错将阴影提取为水体,并且易与冲积物、冰雪和冰水沉积物混淆。笔者以ETM+影像为信息源,采集并分析研究区地物光谱特征,以常用的水体谱间关系模型为基础,利用水体与阴影、冲积物、冰雪和冰水沉积物在可见光波段光谱值的差异及变化规律,对谱间关系法进行改进,并与阈值法结合,构建多条件谱间关系模型,用于南迦巴瓦峰地区水体信息提取。
The Namjagbarwa area in eastern Himalayas Mountain is a high undulant region, when the method of spectral relation- ship is used to take water--body information,a lot of shadows are taken as water--bodies with mistake,and the water--body is also easy to confuse with the ice--snow, alluvium and glacial debris. Supported by the processing technology of remote sensing image, spectral features and spectral differences of various objects in the experimental region were collected and analyzed in detail with Landsat--7 ETM＋ image. The study discovers that the spectral value of the water--body descends slower than the shadow in visible light bands（namelyTM1--TM3）, and the spectrum of the water--body is higher than the shadow＇s spectrum,and lower than the alluvium,ice--snow and glacial debris in TM3 band. On the basis of normal method of spectral relationship and all studies above, a new multi--condition model of spectral relationship with method of threshold and other new spectral relationship was built in this paper. It gained a better result to extract water--body information of Namjagbarwa area with the improved new model
出处
《地理与地理信息科学》
CSCD
北大核心
2008年第2期14-16,22,共4页
Geography and Geo-Information Science
基金
交通部西部交通科技项目(200231800050)
广西教育厅资助项目(200708LX272)
关键词
水体
谱间关系模型
信息提取
东喜马拉雅
water--body
model of spectral relationship
information extracting
the eastern Himalayas
