Nearshore Bathymetry From Fusion of Sentinel-2 and ICESat-2 Observations
Nearshore Bathymetry From Fusion of Sentinel-2 and ICESat-2 Observations
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DOI：
10.1109/lgrs.2020.2987778
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发表时间：
2020-05
影响因子：
4.8
通讯作者：
A. Albright;C. Glennie
中科院分区：
文献类型：
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作者：
A. Albright;C. Glennie
近岸水深估计对于了解海岸过程至关重要。然而，目前用于估计水深的被动遥感方法需要现场深度测量来训练反演模型，这在许多地区可能很难或不可能获得。为了解决这个问题，我们研究了NASA ICESat-2卫星上先进地形激光高度计系统（ATLAS）的距离测量值与欧洲航天局（ESA）Sentinel-2的多光谱卫星图像的融合，使用两种常见的测深反演算法。ATLAS绿色（532纳米）激光器的主动测距能力已被证明可以在光学透明的沃茨产生高达38米深度的回波，提供深度测量以限制被动测深反演结果。2018年11月在美国佛罗里达州德斯廷近岸采集的数据为这种方法提供了概念证明。测深反演的结果通过与2018年11月使用美国陆军海岸带测绘和成像激光雷达（CZMIL）系统收集的机载测深激光雷达进行比较进行了定量评估。总体而言，与CZMIL数据相比，测深反演的结果在具有相似浊度和底部反射率的沃茨中具有0.35 m的均方根误差（RMSE），并表明ICESat-2深度观测与哨兵-2多光谱图像相结合可以估计光学清晰的沿海沃茨的无缝近岸测深。
Nearshore estimates of bathymetry are crucial for understanding coastal processes. However, current passive remote sensing methods for estimating bathymetry require in situ depth measurements to train inversion models, which can be difficult or impossible to obtain in many areas. To address this issue, we investigated the fusion of range measurements from the advanced topographic laser altimeter system (ATLAS) aboard the NASA ICESat-2 satellite, and multispectral satellite imagery from European Space Agency (ESA) Sentinel-2 using two common bathymetric inversion algorithms. The active ranging capability of the ATLAS green (532-nm) laser has been shown to generate returns of up to 38-m depth in optically clear waters, providing depth measurements to constrain passive bathymetric inversion results. Data acquired in November 2018 over the nearshore in Destin, FL, USA, offer a proof of concept for this approach. The results of the bathymetric inversion were quantitatively assessed by comparison with airborne bathymetric LiDAR collected using the U.S. Army Corps Coastal Zone Mapping and Imaging LiDAR (CZMIL) system in October–November 2018. Overall, the results of the bathymetric inversion compared with the CZMIL data have a root mean square error (RMSE) of 0.35 m in waters with similar turbidity and bottom reflectivity, and demonstrate that a combination of ICESat-2 depth observations with Sentinel-2 multispectral imagery can estimate seamless nearshore bathymetry for optically clear coastal waters.