基于CIWI模型的洞庭湖地区水体变化识别

本研究使用混合水体指数模型对洞庭湖地区2003年至2013年的水体面积变化进行识别,并使用监督分类方法提取水体进行验证。研究结果表明,2008年洞庭湖地区水体面积最大,2003年次之,2013年水体面积最小。CIWI模型提取的水体变化趋势与监督分类提取的水体变化趋势一致,但面积明显小于监督分类的结果。使用CIWI水体指数可以有效实现大面积水体的提取。

In this study, combined index of NDVI and NIR for water body identification （CIWI） was used to identify the changes of water body in Dongting Lake region from 2003 to 2013, and supervised classification was used to v＇,didate the results. Results showed that water body in 2008 was the largest, aud water body in 2013 was the smallest. Changes of water body identified by CIWI model were in accordance with the changes of water body identified by supervised classification with a smaller area. CIWI can be used to identify water bodies effectively.