| 摘要: |
| 增强归一化差异水体指数ANDWI（Augmented Normalized Difference Water Index）是一种新颖的、稳健的水体指数，但在某些情况下ANDWI可能对表面漂浮藻华较多的水体提取效果较差；因此，本文顾及水体指数ANDWI的特点及富营养化水体指数MEWI（The Improved Eutrophic Water Body Index）的构建思路，基于富营养化水体等地物的光谱特性，构造了修正的增强归一化差异水体指数MANDWI（Modified Augmented Normalized Difference Water Index）。本文以不同季节、不同藻华等级的太湖进行水体提取验证，将MANDWI与DIBWI（Double Infrared Band Water Index）、MEWI、MBCWI（Multi?Band Combination Water Index）和ANDWI进行对比，结果表明MANDWI适用于不同季节且具有较好的水体提取效果，随着藻华等级提升，MADNWI仍具有较高的水体提取精度（总体精度为0.99、Kappa系数为0.98），而其他水体指数的提取效果较差。MANDWI的提出增强了遥感水体提取能力，对于水资源管理和保护具有重要意义，同时也为类似水体指数的研发提供参考。 |
| 关键词: MANDWI 富营养化 水体提取 大津法 |
| DOI： |
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| 基金项目:(41701487；42230112；42071346)、中央高校基本科研业务费专项(2019B02714)和国家留学联合资助。 |
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| Research on Eutrophic Water Information Extraction Based on Modified Augmented Normalized Difference Water Index |
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Song Hao,Pan Xin,Xie Wen ying,Yang Zi,Huang Zuo ji,Wang Chun lin,Yang Ying bao
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College of Geography and Remote Sensing, Hohai University
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| Abstract: |
| The Augmented Normalized Difference Water Index (ANDWI) is novel and robust. However, in some cases, ANDWI may be less effective in extracting water body with more surface-floating algal bloom. Therefore, considering the characteristics of ANDWI and the construction of the Improved Eutrophic Water Body Index (MEWI), this paper constructed the Modified Augmented Normalized Difference Water Index (MANDWI) based on the spectral characteristics of eutrophic water body and other surface features. In this paper, water extraction verification was carried out in Taihu Lake with different seasons and different algal bloom levels. MANDWI was compared with DIBWI (Double Infrared Band Water Index), MEWI, MBCWI (Multi-Band Combination Water Index), and ANDWI. The results showed that MANDWI was suitable for different seasons and had a good water extraction effect. With the increase of algal bloom level, MADNWI still has high water extraction accuracy (Overall Accuracy is 0.99, Kappa Coefficient is 0.98), while the extraction effects of other indices were poor. The proposal of MANDWI enhanced the ability of remote sensing water extraction, which was of great significance for water resource management and protection, and also provided a reference for the development of similar water body index. |
| Key words: MANDWI eutrophication water body extraction Otsu |
