Cancet M. auteur aut IRD Birol F. auteur aut IRD Vergara O. auteur aut IRD Dagneaux Q. auteur aut IRD Léger F. auteur aut IRD Bignalet-Cazalet F. auteur aut IRD Daguze J. A. auteur aut IRD Fouchet E. auteur aut IRD Homerin A. auteur aut IRD Maraldi C. auteur aut IRD Nino Fernando auteur aut IRD Pujol M. I. auteur aut IRD Tran N. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Observing sea level and its variations is of great importance for many scientific, societal and economic issues. This data paper presents a new coastal high resolution Sea Level Anomaly (SLA) product, ALTICAP (ALTimetry Innovative Coastal Approach Product), derived from along track satellite altimetry. To enable as many coastal applications as possible, collocated altimetric significant wave height and wind data are also provided, as well as quality flags and the geophysical corrections applied to the SLA. Covering all ocean regions between 0 and 500 km from land, and between 66 degrees S and 66 degrees N, this dataset contains 5 years (February 2016 to July 2021) of 20 Hz altimetry measurements from the Jason-3 mission. The altimetric standards and geophysical corrections used to compute the SLA have been selected following a round robin study based on 22 of the most recent algorithms available. The processing solution adopted was a compromise between the capability of each algorithm to provide the best sea level solution over the entire strip between 0 and 200 km from the coast and a guarantee of product continuity in the future.The comparison of ALTICAP and tide gauge SLA time series shows the ability of the ALTICAP product to capture the coastal sea level variability, with average correlation and root mean square deviation values of 0.74 and 9 cm respectively. On global average, altimetry SLA time series remain 80 % complete up to 9 km from the coast after editing. ALTICAP is a global high resolution altimetry sea level product optimized for coastal applications and ensuring quality continuity up to the open ocean, directly available online. The complete protocol followed during the round robin study (Birol et al., 2023), as well as all the results (https://www.aviso.altimetry.fr/en/data/products/sea-surface-height-products/global/altimetry-innovative-coastal-approach-product-alticap.html, last access: 26 March 2026) and the data (LEGOS et al., 2023, 10.24400/527896/a01-2023.020) are freely available online. specialized 126 064 032 18 3 2319-2347 2026 1866-3508 https://www.documentation.ird.fr/hor/fdi:010096904 10.5194/essd-18-2319-2026 1866-3508 [F B010096904] https://www.documentation.ird.fr/hor/fdi:010096904 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2026-05/010096904.pdf IRD - Base Horizon / Pleins textes 2026-05-20 2026-05-20 fdi:010096904 fre