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Satellite derived bathymetry based on ICESat-2 diffuse attenuation signal without prior information
International Journal of Applied Earth Observation and Geoinformation ( IF 7.5 ) Pub Date : 2022-08-30 , DOI: 10.1016/j.jag.2022.102993
Xuechun Zhang, Yi Ma, Zhongwei Li, Jingyu Zhang

Bathymetric information is critical for environmental monitoring and maintenance of marine safety. The signal received by passive optical remote sensors contains the reflectance information from the seabed, which then forms the informational basis of bathymetry; however, passive optical bathymetry models often require partial prior information. Although spaceborne active lidar has been shown to accurately detect bathymetry within narrow range of tracks, for some small islands or coastal sites, these tracks may not accurately traverse the shallow ocean area. To this end, a satellite derived bathymetry method based on ICESat-2 diffuse attenuation signal without prior information was proposed here. The diffuse attenuation coefficients of the water column were estimated according to the ICESat-2 lidar signal of deep areas near the target shallow water area, and the parameters for the bathymetry algorithm without prior depth information were obtained. Combined with the Sentinel-2 multispectral imagery, accurate large-scale bathymetric information of Zhongye Island and Reefs, Guam, and Ngau were obtained. Bathymetric data from ICESat-2 of multiple tracks were used for verification, and the results showed that the new model performed well, as mean absolute error (MAE) for the three study areas ranged 0.35–1.52 m, and root Mean square error (RMSE) fell between 0.74 and 1.89 m. In the absence of any bathymetric information, the new method can achieve higher or similar accuracy to the more commonly employed Stumpf model.



中文翻译:

无先验信息的基于 ICESat-2 漫衰减信号的卫星测深

测深信息对于环境监测和维护海洋安全至关重要。无源光学遥感器接收到的信号包含来自海床的反射率信息,从而形成水深测量的信息基础;然而,被动光学测深模型通常需要部分先验信息。尽管星载有源激光雷达已被证明可以在狭窄的航迹范围内准确检测水深,但对于一些小岛屿或沿海地点,这些航迹可能无法准确穿越浅海区域。为此,本文提出了一种基于无先验信息的ICESat-2漫衰减信号的卫星衍生测深方法。根据目标浅水区附近深部区域的ICESat-2激光雷达信号估计水柱的扩散衰减系数,得到无先验深度信息的测深算法参数。结合Sentinel-2多光谱影像,获得了中业岛和礁、关岛、牛的准确大尺度测深信息。采用ICESat-2多轨测深数据进行验证,结果表明新模型表现良好,三个研究区的平均绝对误差(MAE)范围为0.35~1.52 m,均方根误差(RMSE) ) 落在 0.74 和 1.89 m 之间。在没有任何测深信息的情况下,新方法可以达到与更常用的 Stumpf 模型更高或相似的精度。得到了没有先验深度信息的测深算法参数。结合Sentinel-2多光谱影像,获得了中业岛和礁、关岛、牛的准确大尺度测深信息。采用ICESat-2多轨测深数据进行验证,结果表明新模型表现良好,三个研究区的平均绝对误差(MAE)范围为0.35~1.52 m,均方根误差(RMSE) ) 落在 0.74 和 1.89 m 之间。在没有任何测深信息的情况下,新方法可以达到与更常用的 Stumpf 模型更高或相似的精度。得到了没有先验深度信息的测深算法参数。结合Sentinel-2多光谱影像,获得了中业岛和礁、关岛、牛的准确大尺度测深信息。采用ICESat-2多轨测深数据进行验证,结果表明新模型表现良好,三个研究区的平均绝对误差(MAE)范围为0.35~1.52 m,均方根误差(RMSE) ) 落在 0.74 和 1.89 m 之间。在没有任何测深信息的情况下,新方法可以达到与更常用的 Stumpf 模型更高或相似的精度。获得了中业岛和礁、关岛、牛的准确大尺度测深信息。采用ICESat-2多轨测深数据进行验证,结果表明新模型表现良好,三个研究区的平均绝对误差(MAE)范围为0.35~1.52 m,均方根误差(RMSE) ) 落在 0.74 和 1.89 m 之间。在没有任何测深信息的情况下,新方法可以达到与更常用的 Stumpf 模型更高或相似的精度。获得了中业岛和礁、关岛、牛的准确大尺度测深信息。采用ICESat-2多轨测深数据进行验证,结果表明新模型表现良好,三个研究区的平均绝对误差(MAE)范围为0.35~1.52 m,均方根误差(RMSE) ) 落在 0.74 和 1.89 m 之间。在没有任何测深信息的情况下,新方法可以达到与更常用的 Stumpf 模型更高或相似的精度。

更新日期:2022-08-31
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