A major advance in global bathymetric observation occurred in 2018 with the launch of NASA’s ICESat-2 satellite, carrying a green-wavelength, photon-counting lidar, the Advanced Topographic Laser Altimeter System (ATLAS). Although bathymetric measurement was not initially a design goal for the mission, pre- and post-launch studies revealed ATLAS’s notable bathymetric mapping capability. ICESat-2 bathymetry has been used to support a wide range of coastal and nearshore science objectives. However, analysis of ICESat-2 bathymetry in numerous locations around the world revealed instances of missing or clipped bathymetry in areas where bathymetric measurement should be feasible. These missing data were due to the ATLAS receiver algorithms not being optimized for bathymetry capture. To address this, two updates have been made to ICESat-2’s receiver algorithm parameters with the goal of increasing the area for which ICESat-2 can provide bathymetry. This paper details the parameter changes and presents the results of a two-phased study designed to investigate ICESat-2’s bathymetry enhancements at both local and global scales. The results of both phases confirm that the new parameters achieved the intended goal of increasing the amount of bathymetry provided by ICESat-2. The site-specific phase demonstrates the ability to fill critical bathymetric data gaps in open ocean and coastal settings. The global analysis shows that the area of potential bathymetry approximately doubled, with 6.1 million km² of new area in which bathymetric measurements may be feasible. These enhancements are anticipated to facilitate a range of science objectives and close the gap between ICESat-2 bathymetry and offshore sonar data.

中文翻译：

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分析 ICESat-2 数据采集算法参数增强以改善全球测深覆盖范围

2018 年，随着 NASA 的 ICESat-2 卫星的发射，全球测深观测取得了重大进展，该卫星携带绿波光子计数激光雷达——先进地形激光高度计系统 (ATLAS)。尽管水深测量最初并不是该任务的设计目标，但发射前和发射后的研究揭示了 ATLAS 显着的水深测绘能力。 ICESat-2 测深已被用于支持广泛的沿海和近岸科学目标。然而，对世界各地许多地点的 ICESat-2 测深分析表明，在应该可行的测深测量区域，存在测深缺失或截断的情况。这些丢失的数据是由于 ATLAS 接收器算法没有针对测深捕获进行优化。为了解决这个问题，对ICESat-2的接收器算法参数进行了两次更新，目的是增加ICESat-2可以提供测深的区域。本文详细介绍了参数变化，并介绍了一项两阶段研究的结果，该研究旨在研究 ICESat-2 在局部和全球尺度上的测深增强功能。两个阶段的结果均证实，新参数实现了增加 ICESat-2 提供的测深量的预期目标。特定地点阶段展示了填补公海和沿海环境中关键测深数据空白的能力。全球分析表明，潜在的测深面积大约增加了一倍，有 610 万平方公里^的新区域可以进行测深测量。这些增强功能预计将促进一系列科学目标的实现，并缩小 ICESat-2 测深和近海声纳数据之间的差距。