基于TM影像的水域提取方法研究

Study on Extraction of Water Bodies Based on TM Imagery

在分析洞庭湖ETM+影像中各种地物光谱特征的基础上,找出水体与其它地物之间的光谱值差异,并用单波段阈值法和多波段增强图阈值法进行水体信息提取,分析了两者优缺点,并提出水域综合提取法,即综合利用单波段TM5和多波段谱间关系(NDW I法)建立起适合于研究区水域的水体提取方法。

The remote sensing mechanism and spectral characteristics of water bodies and other objects in ETM＋ imagery of Dong ting Lake were analyzed to identify the Spectral differences between water bodies and other surface features.The single band threshold method and multi-band threshold method are used and compared in extracting Dong ting Lake water body.Then the integrated water body extraction method is proposed based on the comprehensive utilization of the relationship between the single band TM5 method and multi-band spectrum（NDWI） method.