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Performance of Sentinel-3A SAR Altimetry Retrackers: The SAMOSA Coastal Sea Surface Heights for the Baltic Sea

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Fiducial Reference Measurements for Altimetry

Part of the book series: International Association of Geodesy Symposia ((IAG SYMPOSIA,volume 150))

Abstract

Performance of the Sentinel-3A SRAL altimeter data is evaluated in the coastal waters of the Gulf of Finland, Baltic Sea. Sea Surface Heights (SSH) were computed along three ascending passes nearby three tide gauge (TG) sites in Estonia. These SSH were compared to a high-resolution marine geoid model in conjunction with a TG corrected hydrodynamic model (HDM). The SAMOSA2 and SAMOSA+ retracker retrieved SSH values were inter-compared as well. The quality assessment yielded the root mean square error of 115 and 99 mm for the SAMOSA2 and SAMOSA+ retrieved Sentinel-3A SSH data, respectively. The near-zero mean of discrepancies shows that there is no significant systematic bias between the geodetic infrastructure and Sentinel-3A SSH data.

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Acknowledgements

This research was supported by Connecting Europe Facility (CEF) project “FAMOS (Finalising Surveys for the Baltic Motorways of the Sea) Odin” (project VEU16013) and TUT’s internal funding project SS440 “Iterative marine geoid modelling in near-coast regions by using re-tracked satellite altimetry, in-situ and modelled data”. The participation of the prime author in the “International Review Workshop on Satellite Altimetry cal/val activities and applications” in 26-26.04.2018 was supported by International Association of Geodesy. We thank two anonymous reviewers whose helpful comments improved this manuscript.

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Correspondence to Elzbieta Birgiel .

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Birgiel, E., Ellmann, A., Delpeche-Ellmann, N. (2019). Performance of Sentinel-3A SAR Altimetry Retrackers: The SAMOSA Coastal Sea Surface Heights for the Baltic Sea. In: Mertikas, S., Pail, R. (eds) Fiducial Reference Measurements for Altimetry. International Association of Geodesy Symposia, vol 150. Springer, Cham. https://doi.org/10.1007/1345_2019_59

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