| 基于高分影像的城市水体遥感综合分级方法 |
| 摘要点击 2480 全文点击 693 投稿时间：2020-08-28 修订日期：2020-11-16 |
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| 中文关键词 城市水体 水色指数 高分二号 遥感分级 水质参数 |
| 英文关键词 urban water water color index GF-2 remote sensing classification water quality parameters |
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| 中文摘要 |
| 城市水体是城市生态系统中的重要组成部分，为此，针对城市水体提出了一种基于国产高分影像的水环境遥感综合评价方法.在2017~2019年间的南京、无锡、常州和扬州市等城市多次水体采样工作的基础上，分析了城市水体光谱特征与水质参数的相应关系.基于国际标准的色度转换模型和FUI（forel-ule index）水色指数，构建了基于高分二号（GF-2）影像的适用于城市水体的U-FUI（urban forel-ule index）水色指数，实现了城市水体的遥感分级，独立的验证数据表明分级模型的识别正确率可达72%.结果表明，根据U-FUI水色指数可以将城市水体有效地分为U-FUI Ⅰ~U-FUI Ⅵ共6级水体，依次分别代表水色呈蓝色、浅绿色、深绿色、黄色、黄棕色以及灰黑色的水体.其中，U-FUI的Ⅰ级水体水质较好而在城市水体中少有分布，U-FUI的Ⅱ和Ⅲ级水体具有较高的叶绿素a浓度，U-FUI的Ⅳ和Ⅴ级水体的总悬浮物浓度和无机悬浮物浓度相对较高，U-FUI的Ⅵ级水体水质较差且水质参数与各级水体均有较大差异.同时，将该方法成功地应用于2018年4月9日南京市GF-2影像，结果显示南京市水体以U-FUI Ⅱ~U-FUI Ⅳ级水体为主，U-FUI的Ⅰ级、Ⅴ级和Ⅵ级水体在城市中的分布相对较少，空间分布特征与同期原位采样结果一致. |
| 英文摘要 |
| Urban water is a significant part of the urban ecosystem. Therefore, a comprehensive evaluation method of the water environment was proposed based on domestic high-resolution images. The relationships between the spectral characteristics and water quality parameters of urban water were analyzed based on sampling in Nanjing, Wuxi, Changzhou, and Yangzhou from 2017 to 2019. An index named the U-FUI (urban Forel-Ule index) suitable for urban water based on GF-2 images was proposed to achieve the classification of urban water on the basis of the international standard chroma conversion model and the Forel-Ule index. Independent verification data showed that the recognition accuracy of the classification model could reach 72%. The results indicated that urban water can be classified into six classes from Ⅰ to Ⅵ, which represent water colors of blue, light green, dark green, yellow, yellowish brown, and dark grey, respectively, according to the U-FUI. Among them, the water quality of U-FUI Ⅰ water is good, but is rarely distributed in urban water. The concentrations of chlorophyll-a in U-FUI Ⅱ-Ⅲ water are higher than those of the other classes; the concentrations of total suspended solids, particularly inorganic suspended solids, of U-FUI Ⅳ-Ⅴ water are higher than those of the other classes; and the water quality of U-FUI Ⅵ water is poor and the water quality parameters are different from those of the other classes. Meanwhile, the method was successfully applied to the GF-2 image of Nanjing on April 9, 2018. The results showed that the urban water in Nanjing is mainly composed of U-FUI Ⅱ-Ⅳ water, whereas the distribution of U-FUI Ⅰ, Ⅴ, and Ⅵ water is lower in the city. The spatial distribution characteristics were consistent with the results of in-situ sampling in the same period. |
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