Monitoring the Performance of HY-2B and Jason-2/3 Sea Surface Height via the China Altimetry Calibration Cooperation Plan

Yang, Lei; Xu, Yanling; Lin, Mingsen; Ma, Chaofei; Mertikas, Stelios P.; Hu, Wei; Wang, Zhiyong; Mu, Bo; Zhou, Xinghua

doi:10.1109/tgrs.2022.3153631

Cited by 6 publications

(8 citation statements)

References 50 publications

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“…In this research, we aim to assess the accuracy of the above altimeter missions by comparing the SSH with in situ measurements of WSCS. In contrast to previous work in the region [15], our study is more comprehensive and particular. We have introduced the equipment and data processing strategies of WSCS in detail since August 2019.…”

Section: Introductionmentioning

confidence: 89%

“…It is essential to define the local MSS/sea surface between the coastal ATGs and altimeter footprints in the Cal/Val campaigns [12,15]. The MSS corrections in altimeter calibration can be maintained by self-measured sea surface and global/regional MSS models [18,33].…”

Section: Mssmentioning

confidence: 99%

“…For tidal corrections, the more precise global or regional tide models were used in the Cal/Val of altimeters such as FES2014, NAO99jb, GOT, etc. [15]. After that, there are many methods to accomplish the Cal/Val of altimeters, such as the DGB, tide gauges, transponder, moored oceanographic instruments, etc.…”

Section: Introductionmentioning

confidence: 99%

“…For tidal corrections, the more precise global or regional tide models were used in the Cal/Val of altimeters such as FES2014, NAO99jb, GOT, etc. [15].…”

Section: Introductionmentioning

confidence: 99%

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Altimeter Calibrations in the Preliminary Four Years’ Operation of Wanshan Calibration Site

Zhai,

Zhu,

Peng

et al. 2024

Remote Sensing

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In order to accomplish the calibration and validation (Cal/Val) of altimeters, the Wanshan calibration site (WSCS) has been used as a calibration site for satellite altimeters since its completion in August 2019. In this paper, we introduced the WSCS and the dedicated equipment including permanent GNSS reference stations (PGSs), acoustic tide gauges (ATGs), and dedicated GNSS buoys (DGB), etc. placed on Zhi’wan, Wai’ling’ding, Dan’gan, and Miao’Wan islands of the WSCS. The PGSs data of Zhi’wan and Wai’ling’ding islands were processed and analyzed using the GAMIT/GLOBK (Version 10.7) and Hector (Version 1.9) software to define the datum for Cal/Val of altimeters in WSCS. The DGB was used to transfer the datum from the PGSs to the ATGs of Zhi’wan, Wai’ling’ding, and Dan’gan islands. Separately, the tidal and mean sea surface (MSS) corrections are needed in the Cal/Val of altimeters. We evaluated the global/regional tide models of FES2014, HAMTIDE12, DTU16, NAO99jb, GOT4.10, and EOT20 using the three in situ tide gauge data of WSCS and Hong Kong tide gauge data (No. B329) derived from the Global Sea Level Observing System. The HAMTIDE12 tide model was chosen to be the most accurate one to maintain the tidal difference between the locations of the ATGs and the altimeter footprints. To establish the sea surface connections between the ATGs and the altimeter footprints, a GPS towing body and a highly accurate ship-based SSH measurement system (HASMS) were used to measure the sea surface of this area in 2018 and 2022, respectively. The global/regional mean sea surface (MSS) models of DTU 2021, EGM 2008 (mean dynamic topography minus by CLS_MDT_2018), and CLS2015 were accurately evaluated using the in situ measured data and HY-2A altimeter, and the CLS2015 MSS model was used for Cal/Val of altimeters in WSCS. The data collected by the equipment of WSCS, related auxiliary models mentioned above, and the sea level data of the hydrological station placed on Dan’gan island were used to accomplish the Cal/Val of HY-2B, HY-2C, Jason-3, and Sentinel-3A (S3A) altimeters. The bias of HY-2B (Pass No. 375) was −16.7 ± 45.2 mm, with a drift of 0.5 mm/year. The HY-2C biases were −18.9 ± 48.0 mm with drifts of 0.0 mm/year and −5.6 ± 49.3 mm with −0.3 mm/year drifts for Pass No. 170 and 185, respectively. The Jason-3 bias was −4.1 ± 78.7 mm for Pass No. 153 and −25.8 ± 85.5 mm for Pass No. 012 after it has changed its orbits since April 2022, respectively. The biases of S3A were determined to be −16.5 ± 46.3 mm with a drift of −0.6 mm/year and −9.8 ± 30.1 mm with a drift of 0.5 mm/year for Pass No. 260 and 309, respectively. The calibration results show that the WSCS can commercialize the satellite altimeter calibration. We also discussed the calibration potential for a wide swath satellite altimeter of WSCS.

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Section: Introductionmentioning

confidence: 89%

Section: Mssmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…For tidal corrections, the more precise global or regional tide models were used in the Cal/Val of altimeters such as FES2014, NAO99jb, GOT, etc. [15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Altimeter Calibrations in the Preliminary Four Years’ Operation of Wanshan Calibration Site

Zhai,

Zhu,

Peng

et al. 2024

Remote Sensing

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show abstract

“…HY-2B and HY-2C were launched in October 2018 and in September 2020 respectively. HY-2B is equipped with dual-frequency altimeters (Ku and C bands), with a revisit period of 14 days in the early stage of the mission and 168 days at the end of the mission [89]. Also, the orbit revisit period of HY-2C is 10 days at the initial stage of the mission and it will become 400 days at the final stages [90].…”

Section: Radar Altimetry Satellite Missionsmentioning

confidence: 99%

Inland Water Level Monitoring from Satellite Observations: A Scoping Review of Current Advances and Future Opportunities

Kossieris,

Tsiakos,

Tsimiklis

et al. 2024

Remote Sensing

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Inland water level and its dynamics are key components in the global water cycle and land surface hydrology, significantly influencing climate variability and water resource management. Satellite observations, in particular altimetry missions, provide inland water level time series for nearly three decades. Space-based remote sensing is regarded as a cost-effective technique that provides measurements of global coverage and homogeneous accuracy in contrast to in-situ sensors. The advent of Open-Loop Tracking Command (OLTC), and Synthetic Aperture Radar (SAR) mode strengthened the use of altimetry missions for inland water level monitoring. However, it is still very challenging to obtain accurate measurements of water level over narrow rivers and small lakes. This scoping systematic literature review summarizes and disseminates the research findings, highlights major results, and presents the limitations regarding inland water level monitoring from satellite observations between 2018 and 2022. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline and through a double screening process, 48 scientific publications were selected meeting the eligibility criteria. To summarize the achievements of the previous 5 years, we present fundamental statistical results of the publications, such as the annual number of publications, scientific journals, keywords, and study regions per continent and type of inland water body. Also, publications associated with specific satellite missions were analyzed. The findings show that Sentinel-3 is the dominant satellite mission, while the ICESat-2 laser altimetry mission has exhibited a high growth trend. Furthermore, publications including radar altimetry missions were charted based on the retracking algorithms, presenting the novel and improved methods of the last five years. Moreover, this review confirms that there is a lack of research on the collaboration of altimetry data with machine learning techniques.

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The Wind Effect on Interferometric Altimeter Validation Using Steric Method in South China Sea

Zhang,

Wang

et al. 2023

IEEE Trans. Geosci. Remote Sensing

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Monitoring the Performance of HY-2B and Jason-2/3 Sea Surface Height via the China Altimetry Calibration Cooperation Plan

Cited by 6 publications

References 50 publications

Altimeter Calibrations in the Preliminary Four Years’ Operation of Wanshan Calibration Site

Altimeter Calibrations in the Preliminary Four Years’ Operation of Wanshan Calibration Site

Inland Water Level Monitoring from Satellite Observations: A Scoping Review of Current Advances and Future Opportunities

The Wind Effect on Interferometric Altimeter Validation Using Steric Method in South China Sea

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