东南亚边缘海Sentinel-3A合成孔径雷达（SAR）模式测高数据的重跟踪海洋参数评估
Assessment of Retracked Ocean Parameters from Sentinel 3A Synthetic Aperture Radar (SAR) Mode Altimetry over the Marginal Seas at Southeast Asia
AI总结：
本文评估Sentinel-3A SAR模式测高数据在东南亚群岛海域的表现，发现SAMOSA+重跟踪器在对比大地水准面高度和验潮站数据时精度最优，RMSE均小于20 cm。
摘要：
本文介绍了对运行于合成孔径雷达（SAR）模式的Sentinel-3A卫星测高数据的评估，该评估面向东南亚最大群岛区域的海平面研究与应用。通过分析波形的物理形态、与准独立的大地水准面高度数据以及独立验潮站测量数据进行对比，开展了定性与定量评估。结果表明，类海洋波形与非类海洋波形的占比分别为91%和9%。在9%的非类海洋波形中，主要类别为多峰波形（7%），其次是在海岸线附近（<10 km）观测到的准镜面波形（2%）。类海洋波形通常出现在距海岸线500 m以外。在与大地水准面高度和验潮站测量数据对比时，评估了多个重跟踪器所得海平面的性能。SAMOSA+重跟踪器优于其他重跟踪器（即子波形重跟踪器和改进阈值重跟踪器，阈值分别为30%、20%和10%）。也就是说，在大多数情况下，其与大地水准面高度差值的标准差以及对验潮站的时间相关性均更优。就均方根误差（RMSE）而言，所有重跟踪器在所有情况下的RMSE均小于20 cm。可以得出结论：总体而言，SAMOSA+重跟踪的海平面在东南亚复杂区域是准确的。
英文摘要：
This paper presents the assessment of altimetric data from Sentinel-3A satellite operating in Synthetic Aperture Radar (SAR) mode for sea level research studies and applications over the largest archipelagos at Southeast Asia. Both qualitative and quantitative assessments are conducted by analysing the physical shapes of waveforms, comparing with quasi-independent geoidal height data and independent tide gauge measurements. The results identified the percentage of ocean like and non-ocean like waveforms are 91% and 9%, respectively. Off 9% of non-ocean like waveforms, the major class is multi-peak (7%) followed by the quasi-specular waveforms (2%) observed near the coastline (<10 km). Ocean like waveforms typically appear beyond 500 m from the coastline. When comparing with geoidal heights and tide gauge measurements, the performance of sea levels from several retrackers are assessed. The SAMOSA+ retracker outperforms other retrackers (i.e. sub-waveform and modified threshold retrackers with 30%, 20% and 10%). That is, the standard deviation of differences against geoidal heights, and the temporal correlation against tide gauges are superior in most cases. In terms of root mean square error (RMSE), all retrackers are ranging with RMSE <20 cm in all cases. It can be concluded that in general, the SAMOSA+ retracked sea levels are accurate over the complicated regions at the Southeast Asia.
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