Aquatic environmental monitoring of inland waters based on UAV hyperspectral remote sensing
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摘要: 本研究以上海市崇明岛内陆水体为研究区,通过无人机高光谱遥感影像对水体颜色变化及疑似污染水体识别进行研究。首先,对无人机搭载的高光谱传感器探测获得的辐亮度信号,进行了遥感反射率标定,通过与现场观测对比,该标定方法准确度较高,各波段平均无偏绝对百分比误差的均值为13.34%,决定系数R2均值为0.83。进一步,利用河湖水体高光谱遥感反射率根据CIE-XYZ颜色标准和加权调和平均法反演了色相角(Hue angle)、表观波长(apparent visible wavelength,AVW),根据实测数据构建水质参数反演模型。通过设定色相角阈值对研究区水体颜色进行分类,结果表明: 崇明区在枯水期的河湖黄棕色异常水体较多,且需加强主要航运河流的水环境监管和治理。最后综合水体颜色参量和水质参数结果对河湖疑似污染水体进行识别和分析。研究表明: 无人机高光谱获得的高时空连续性的水体颜色参量和水质参数反演结果,在节约成本的同时为河湖水环境调查提供了可靠的技术支持。Abstract: With the inland waters in Chongming Island, Shanghai as the study area, this study researched the color changes of waters and the identification of suspected polluted waters using unmanned aerial vehicle (UAV) hyperspectral remote sensing images. First, reflectance calibration was carried out for the radiance signals detected by the hyperspectral sensor carried by UAVs. Compared with on-site observations, this calibration method was more accurate, the average unbiased absolute percentage differences of various bands were 13.34% on average and the average determination coefficient R2 was 0.83. Afterward, the inversion of hue angle and apparent visible wavelength (AVW) was conducted using the hyperspectral reflectance of the inland waters according to the CIE-XYZ color space and weighted harmonic mean. Then an inversion model of water quality parameters was constructed based on measured data, and the water colors in the study area were classified by setting the threshold of hue angle. As indicated by the results, there exist many abnormal yellowish-brown inland waters in the Chongming Island in dry seasons and it is necessary to strengthen the supervision and governance of the aquatic environment of major shipping rivers. Finally, the suspected polluted inland waters were identified and analyzed by integrating the inversion results of the parameters of water color and water quality. This study shows that UAV hyperspectral remote sensing can be used to obtain the inversion results with high temporal-spatial continuity of the parameters of water color and water quality, which will provide credible technical support for the aquatic environment investigations of inland waters while saving costs.
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Key words:
- UAV /
- hyperspectral remote sensing /
- water colour /
- inland waters /
- aquatic environment /
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