Performance Assessment of Surface Water and Ocean Topography (SWOT) Mission for WSE Measurement Across India

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-05-22 DOI:10.1029/2025GL115804

Girish Patidar, J. Indu, Subhankar Karmakar

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Abstract

The Surface Water and Ocean Topography (SWOT) mission, launched in December 2022, is the first wide-swath altimetry mission designed to improve our understanding of surface water dynamics through high-resolution water surface elevation (WSE) and extent measurements. This study presents the first-hand validation of SWOT WSE data from April 2023 to December 2024 across 419 stations in India, analyzing 14,892 SWOT WSE observations. Our findings indicate that SWOT performs well for rivers wider than 100 m, with a Spearman's correlation (ρ_s) exceeding 0.88 for the 68th percent of stations with a relative error (RE) in WSE of 18 cm. Even for narrower rivers, SWOT achieves accuracies exceeding expectations (RE of 25.78 cm). Over reservoirs, SWOT demonstrates strong performance, with RE values of 10.80 cm (node product) and 13.64 cm (lake product), while maintaining ρ_s above 0.65 for all reservoirs analyzed, highlighting SWOT's robust potential for monitoring diverse water bodies in India.

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印度地表水和海洋地形（SWOT）测量任务的性能评估

地表水和海洋地形（SWOT）任务于2022年12月启动，是第一个宽波段测高任务，旨在通过高分辨率水面高程（WSE）和范围测量提高我们对地表水动力学的理解。本研究对印度419个站点2023年4月至2024年12月的SWOT WSE数据进行了第一手验证，分析了14892个SWOT WSE观测值。我们的研究结果表明，SWOT对宽度大于100米的河流表现良好，相对误差（RE）为18厘米的68%的站点的Spearman相关（ρs）超过0.88。即使对于较窄的河流，SWOT也能达到超出预期的精度（RE为25.78 cm）。在水库方面，SWOT表现出强劲的表现，其RE值为10.80 cm（节点产品）和13.64 cm（湖泊产品），而所分析的所有水库的ρs均保持在0.65以上，这凸显了SWOT在监测印度不同水体方面的强大潜力。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.