Validation of Inland Water Surface Elevation from SWOT Satellite Products: A Case Study in the Middle and Lower Reaches of the Yangtze River DOI Creative Commons
Yao Zhao,

June Fu,

Zhiguo Pang

et al.

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(8), P. 1330 - 1330

Published: April 8, 2025

The Surface Water and Ocean Topography (SWOT) satellite mission, jointly developed by NASA several international collaboration agencies, aims to achieve high-resolution two-dimensional observations of global surface water. Equipped with the advanced Ka-band radar interferometer (KaRIn), it significantly enhances ability monitor water provides a new data source for obtaining large-scale elevation (WSE) at high temporal spatial resolution. However, accuracy applicability its scientific products inland bodies still require validation. This study obtained three from SWOT between August 2023 December 2024: Level 2 KaRIn high-rate river single-pass vector product (L2_HR_RiverSP), lake (L2_HR_LakeSP), mask pixel cloud (L2_HR_PIXC). These were compared in situ level validate their retrieving levels across eight different regions middle lower reaches Yangtze River (MLRYR) evaluate each product. experimental results show following: (1) inversion L2_HR_RiverSP L2_HR_LakeSP varies regions. In some areas, extracted WSE aligns closely trend, coefficient determination (R2) exceeding 0.9, while other R2 is (less than 0.8), error larger (with Root Mean Square Error (RMSE) greater 1.0 m). (2) proposes combined denoising method based on Interquartile Range (IQR) Adaptive Statistical Outlier Removal (ASOR). Compared products, L2_HR_PIXC product, after denoising, shows significant improvements all metrics inversion, 0.85, Absolute (MAE) less 0.4 m, RMSE 0.5 m. Overall, demonstrates capability precision, especially through which broader application potential will play an important role dynamics monitoring refined resource management research.

Language: Английский

Validation of Inland Water Surface Elevation from SWOT Satellite Products: A Case Study in the Middle and Lower Reaches of the Yangtze River DOI Creative Commons
Yao Zhao,

June Fu,

Zhiguo Pang

et al.

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(8), P. 1330 - 1330

Published: April 8, 2025

The Surface Water and Ocean Topography (SWOT) satellite mission, jointly developed by NASA several international collaboration agencies, aims to achieve high-resolution two-dimensional observations of global surface water. Equipped with the advanced Ka-band radar interferometer (KaRIn), it significantly enhances ability monitor water provides a new data source for obtaining large-scale elevation (WSE) at high temporal spatial resolution. However, accuracy applicability its scientific products inland bodies still require validation. This study obtained three from SWOT between August 2023 December 2024: Level 2 KaRIn high-rate river single-pass vector product (L2_HR_RiverSP), lake (L2_HR_LakeSP), mask pixel cloud (L2_HR_PIXC). These were compared in situ level validate their retrieving levels across eight different regions middle lower reaches Yangtze River (MLRYR) evaluate each product. experimental results show following: (1) inversion L2_HR_RiverSP L2_HR_LakeSP varies regions. In some areas, extracted WSE aligns closely trend, coefficient determination (R2) exceeding 0.9, while other R2 is (less than 0.8), error larger (with Root Mean Square Error (RMSE) greater 1.0 m). (2) proposes combined denoising method based on Interquartile Range (IQR) Adaptive Statistical Outlier Removal (ASOR). Compared products, L2_HR_PIXC product, after denoising, shows significant improvements all metrics inversion, 0.85, Absolute (MAE) less 0.4 m, RMSE 0.5 m. Overall, demonstrates capability precision, especially through which broader application potential will play an important role dynamics monitoring refined resource management research.

Language: Английский

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