CoAuthors

Florence Birol (LEGOS / Université de Toulouse, CNES, CNRS, IRD, UPS, France); Fabien Blarel (LEGOS / Université de Toulouse, CNES, CNRS, IRD, UPS, France); Wassim Fkaier (LEGOS / Université de Toulouse, CNES, CNRS, IRD, UPS, France); Fabien Léger (LEGOS / Université de Toulouse, CNES, CNRS, IRD, UPS, France); Mathilde Cancet (Noveltis, France); Ergane Fouchet (Noveltis, France); Fanny Piras (CLS, France); Hélène Roinard (France, France); Pierre Féménias (ESA, Italy)

The FDR4ALT project ran between october 2019 and july 2023, and strived to provide fundamental data records for the Envisat and ERS-1 and ERS-2 altimetry missions. This included the creation of thematic data products tailored for specific needs, and a TDP global coastal product is one of them.

In this poster we present the project scope and different choices made, including the partial results of a round robin assessment which was used to determine the best set of altimetry corrections to use. Regional tide solutions were used for the Mediterranean and the North Eastern Atlantic regions, to improve the quality of the altimetric measurement.

Although the TDP Coastal Product is a level 2 along-track product, the quality assessment includes comparison with tide gauge measurements, so a level-3 reprojected product was created to obtain timeseries that could be compared to tide gauge measurements. We present hence the final assessment of the coastal product in terms of along-track behaviour (in terms of distance to the coast), general statistics of data quality and availability, and finally the comparison with tide gauges for selected points of the world.