An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR data
ABSTRACTStudies on the retrieval of ocean surface current by Synthetic Aperture Radar (SAR) mainly concentrate on coastal regions with land coverage, allowing for continuous land to estimate non-geophysical Doppler shifts. As a strong western boundary in the Western Pacific, the Kuroshio flows throu...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2024-12-01
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| Series: | GIScience & Remote Sensing |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/15481603.2024.2304956 |
| _version_ | 1797351436453937152 |
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| author | Benhua Tan Lihua Wang Dechen Ge Zhen Fang Weiwei Sun Tian Feng |
| author_facet | Benhua Tan Lihua Wang Dechen Ge Zhen Fang Weiwei Sun Tian Feng |
| author_sort | Benhua Tan |
| collection | DOAJ |
| description | ABSTRACTStudies on the retrieval of ocean surface current by Synthetic Aperture Radar (SAR) mainly concentrate on coastal regions with land coverage, allowing for continuous land to estimate non-geophysical Doppler shifts. As a strong western boundary in the Western Pacific, the Kuroshio flows through mostly islands or open sea, and lacks land coverage for range bias correction. We propose a non-geophysical Doppler shift correction algorithm suitable for Kuroshio observation. Three solutions matching different land coverage were adopted in the range direction, and the scalloping was removed by using average filtering in the azimuth direction. Comparison between SAR radial velocity and Global Surface Lagrangian Drifter (GLD) reveals that the correlation coefficient (R2) increase to 0.686, and root mean square error (RMSE) of 0.215 m/s after non-geophysical corrections, while the wind-wave bias corrections make R2 increase to 0.806 and RMSE decrease to 0.13 m/s. There is also a good consistency between SAR inversion and Regional Ocean Circulation Model (ROMS). Sensitivity analysis illustrates that ascending pass is more suitable for monitoring Kuroshio, and high incidence angles are less affected by ocean conditions and non-geophysical factors. The algorithm can be used in regions with discontinuous or absent land. |
| first_indexed | 2024-03-08T13:00:24Z |
| format | Article |
| id | doaj.art-7e03c36f438b4b9b824906095f87fbbf |
| institution | Directory Open Access Journal |
| issn | 1548-1603 1943-7226 |
| language | English |
| last_indexed | 2024-03-08T13:00:24Z |
| publishDate | 2024-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | GIScience & Remote Sensing |
| spelling | doaj.art-7e03c36f438b4b9b824906095f87fbbf2024-01-19T08:54:50ZengTaylor & Francis GroupGIScience & Remote Sensing1548-16031943-72262024-12-0161110.1080/15481603.2024.2304956An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR dataBenhua Tan0Lihua Wang1Dechen Ge2Zhen Fang3Weiwei Sun4Tian Feng5Department of Geography and Spatial Information Techniques, Zhejiang Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo, ChinaDepartment of Geography and Spatial Information Techniques, Zhejiang Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo, ChinaDepartment of Geography and Spatial Information Techniques, Zhejiang Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo, ChinaDepartment of Geography and Spatial Information Techniques, Zhejiang Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo, ChinaDepartment of Geography and Spatial Information Techniques, Zhejiang Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo, ChinaDepartment of Geography and Spatial Information Techniques, Zhejiang Collaborative Innovation Center for Land and Marine Spatial Utilization and Governance Research, Ningbo University, Ningbo, ChinaABSTRACTStudies on the retrieval of ocean surface current by Synthetic Aperture Radar (SAR) mainly concentrate on coastal regions with land coverage, allowing for continuous land to estimate non-geophysical Doppler shifts. As a strong western boundary in the Western Pacific, the Kuroshio flows through mostly islands or open sea, and lacks land coverage for range bias correction. We propose a non-geophysical Doppler shift correction algorithm suitable for Kuroshio observation. Three solutions matching different land coverage were adopted in the range direction, and the scalloping was removed by using average filtering in the azimuth direction. Comparison between SAR radial velocity and Global Surface Lagrangian Drifter (GLD) reveals that the correlation coefficient (R2) increase to 0.686, and root mean square error (RMSE) of 0.215 m/s after non-geophysical corrections, while the wind-wave bias corrections make R2 increase to 0.806 and RMSE decrease to 0.13 m/s. There is also a good consistency between SAR inversion and Regional Ocean Circulation Model (ROMS). Sensitivity analysis illustrates that ascending pass is more suitable for monitoring Kuroshio, and high incidence angles are less affected by ocean conditions and non-geophysical factors. The algorithm can be used in regions with discontinuous or absent land.https://www.tandfonline.com/doi/10.1080/15481603.2024.2304956SARDoppler shiftnon-geophysicalocean currentKuroshio |
| spellingShingle | Benhua Tan Lihua Wang Dechen Ge Zhen Fang Weiwei Sun Tian Feng An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR data GIScience & Remote Sensing SAR Doppler shift non-geophysical ocean current Kuroshio |
| title | An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR data |
| title_full | An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR data |
| title_fullStr | An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR data |
| title_full_unstemmed | An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR data |
| title_short | An investigation of inversion method to measure the radial velocity of Kuroshio from Sentinel-1 SAR data |
| title_sort | investigation of inversion method to measure the radial velocity of kuroshio from sentinel 1 sar data |
| topic | SAR Doppler shift non-geophysical ocean current Kuroshio |
| url | https://www.tandfonline.com/doi/10.1080/15481603.2024.2304956 |
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