Underwater Hyperspectral Imaging Using a Stationary Platform in the Trans-Atlantic Geotraverse Hydrothermal Field
Underwater Hyperspectral Imaging Using a Stationary Platform in the Trans-Atlantic Geotraverse Hydrothermal Field
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DOI：
10.1109/tgrs.2018.2878923
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发表时间：
2019-05-01
影响因子：
8.2
通讯作者：
Murton, Bramley J.
中科院分区：
文献类型：
--
作者：
Dumke, Ines;Ludvigsen, Martin;Murton, Bramley J.
水下高光谱成像是表征海底成分的一种相对较新的方法。迄今为止，它已通过移动水下航行器部署，例如遥控航行器和自主水下航行器。虽然移动车辆可以相对快速地测量几个 10-1000 m(2) 的距离，但它们会受到车辆姿态的短期变化的影响，这通常会影响图像采集和质量。在这项研究中，我们测试了一个降落在海底的固定平台，并在垂直摆动支架上使用了水下高光谱成像仪（UHI）。成像的海底区域尺寸为 2.3 m x 1 m，具有非常稳定的高空间分辨率 UHI 数据。研究区域为位于大西洋中脊（北纬26度）的跨大西洋Geotraverse热液田，水深3530-3660米。 UHI 数据是从活跃和非活跃热液硫化物丘上的 12 个站点获取的。基于监督分类，检测到了 24 种光谱不同的海底物质，包括热液和非热液物质以及底栖动物群。结果表明，UHI数据能够在光谱上区分热液区域不同类型的表层物质和底栖动物群，因此可能成为未来潜在深海矿区高分辨率海底勘探的有前途的工具。
Underwater hyperspectral imaging is a relatively new method for characterizing seafloor composition. To date, it has been deployed from moving underwater vehicles, such as remotely operated vehicles and autonomous underwater vehicles. While moving vehicles allow relatively rapid surveying of several 10-1000 m(2), they are subjected to short-term variations in vehicle attitude that often compromise image acquisition and quality. In this study, we tested a stationary platform that was landed on the seabed and used an underwater hyperspectral imager (UHI) on a vertical swinging bracket. The imaged seafloor areas have dimensions of 2.3 m x 1 m and are characterized by very stable UHI data of high spatial resolution. The study area was the Trans-Atlantic Geotraverse hydrothermal field at the Mid-Atlantic Ridge (26 degrees N) in water depths of 3530-3660 m. UHI data were acquired a 12 stations on an active and an inactive hydrothermal sulfide mound. Based on supervised classification, 24 spectrally different seafloor materials were detected, including hydrothermal and non-hydrothermal materials, and benthic fauna. The results show that the UHI data are able to spectrally distinguish different types of surface materials and benthic fauna in hydrothermal areas, and may therefore represent a promising tool for high-resolution seafloor exploration in potential future deep-sea mining areas.