{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T23:52:52Z","timestamp":1786665172241,"version":"build-2736575974"},"reference-count":34,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2023,8,24]],"date-time":"2023-08-24T00:00:00Z","timestamp":1692835200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"EU","award":["4000134346\/21\/NL\/AD"],"award-info":[{"award-number":["4000134346\/21\/NL\/AD"]}]},{"name":"ESA","award":["4000134346\/21\/NL\/AD"],"award-info":[{"award-number":["4000134346\/21\/NL\/AD"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>This study presents a comparative analysis of the coastal performances of Sentinel-6 and Jason-3 altimeters during their tandem phase, considering their different processing modes. We examine the measurements available in the standard geophysical data records (GDR) and also perform dedicated reprocessing using coastal retracking algorithms applied to the original waveforms. The performances are evaluated, taking into account the quality of retrievals (outlier analysis), their precision (along-track noise analysis), potential systematic biases, and accuracy (comparison against tide gauges). The official SAR altimetry product of Sentinel-6 demonstrates improved coastal monitoring capabilities compared to Jason-3, except for the remaining issues related to significant wave height, which have already been identified. These findings highlight the significance of dedicated coastal retracking algorithms for enhancing the capabilities of both traditional, pulse-limited altimeters and more recent developments utilizing SAR altimetry.<\/jats:p>","DOI":"10.3390\/rs15174161","type":"journal-article","created":{"date-parts":[[2023,8,24]],"date-time":"2023-08-24T10:23:40Z","timestamp":1692872620000},"page":"4161","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Coastal Assessment of Sentinel-6 Altimetry Data during the Tandem Phase with Jason-3"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3372-3948","authenticated-orcid":false,"given":"Marcello","family":"Passaro","sequence":"first","affiliation":[{"name":"Deutsches Geod\u00e4tisches Forschungsinstitut der Technischen Universit\u00e4t M\u00fcnchen (DGFI-TUM), Arcisstra\u00dfe 21, 80333 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6872-3668","authenticated-orcid":false,"given":"Florian","family":"Schlembach","sequence":"additional","affiliation":[{"name":"Deutsches Geod\u00e4tisches Forschungsinstitut der Technischen Universit\u00e4t M\u00fcnchen (DGFI-TUM), Arcisstra\u00dfe 21, 80333 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3950-0881","authenticated-orcid":false,"given":"Julius","family":"Oelsmann","sequence":"additional","affiliation":[{"name":"Deutsches Geod\u00e4tisches Forschungsinstitut der Technischen Universit\u00e4t M\u00fcnchen (DGFI-TUM), Arcisstra\u00dfe 21, 80333 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8940-4639","authenticated-orcid":false,"given":"Denise","family":"Dettmering","sequence":"additional","affiliation":[{"name":"Deutsches Geod\u00e4tisches Forschungsinstitut der Technischen Universit\u00e4t M\u00fcnchen (DGFI-TUM), Arcisstra\u00dfe 21, 80333 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0718-6069","authenticated-orcid":false,"given":"Florian","family":"Seitz","sequence":"additional","affiliation":[{"name":"Deutsches Geod\u00e4tisches Forschungsinstitut der Technischen Universit\u00e4t M\u00fcnchen (DGFI-TUM), Arcisstra\u00dfe 21, 80333 Munich, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,8,24]]},"reference":[{"key":"ref_1","first-page":"1","article-title":"Satellite Altimetry","volume":"Volume 69","author":"Fu","year":"2001","journal-title":"Satellite Altimetry and Earth Sciences: A Handbook of Techniques and Applications"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Vignudelli, S., Kostianoy, A., Cipollini, P., and Benveniste, J. (2011). Coastal Altimetry, Springer.","DOI":"10.1007\/978-3-642-12796-0"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1402","DOI":"10.1093\/gji\/ggt469","article-title":"Retracking CryoSat-2, Envisat and Jason-1 radar altimetry waveforms for improved gravity field recovery","volume":"196","author":"Garcia","year":"2014","journal-title":"Geophys. J. Int."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"841","DOI":"10.1016\/j.asr.2005.07.027","article-title":"CryoSat: A mission to determine the fluctuations in Earth\u2019s land and marine ice fields","volume":"37","author":"Wingham","year":"2006","journal-title":"Adv. Space Res."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1171","DOI":"10.1109\/LGRS.2012.2235138","article-title":"Maximizing the intrinsic precision of radar altimetric measurements","volume":"10","author":"Raney","year":"2013","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"474","DOI":"10.1109\/LGRS.2009.2039193","article-title":"Modeling ENVISAT RA-2 waveforms in the coastal zone: Case study of calm water contamination","volume":"7","author":"Vignudelli","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"50","DOI":"10.1016\/j.rse.2015.07.023","article-title":"Improved wet path delays for all ESA and reference altimetric missions","volume":"169","author":"Fernandes","year":"2015","journal-title":"Remote Sens. Environ."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.rse.2014.02.008","article-title":"ALES: A multi-mission subwaveform retracker for coastal and open ocean altimetry","volume":"145","author":"Passaro","year":"2014","journal-title":"Remote Sens. Environ."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"2398","DOI":"10.1016\/j.asr.2021.01.049","article-title":"The X-TRACK\/ALES multi-mission processing system: New advances in altimetry towards the coast","volume":"67","author":"Birol","year":"2021","journal-title":"Adv. Space Res."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"647607","DOI":"10.3389\/fmars.2021.647607","article-title":"Absolute Baltic Sea Level Trends in the Satellite Altimetry Era: A Revisit","volume":"8","author":"Passaro","year":"2021","journal-title":"Front. Mar. Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"357","DOI":"10.1038\/s41597-020-00694-w","article-title":"(The Climate Change Initiative Coastal Sea Level Team) Coastal sea level anomalies and associated trends from Jason satellite altimetry over 2002\u20132018","volume":"7","author":"Benveniste","year":"2020","journal-title":"Sci. Data"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"331","DOI":"10.5194\/os-18-331-2022","article-title":"Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography","volume":"18","author":"Mangini","year":"2022","journal-title":"Ocean Sci."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1371","DOI":"10.1016\/j.asr.2017.12.018","article-title":"Coastal SAR and PLRM altimetry in german bight and west baltic sea","volume":"62","author":"Dinardo","year":"2018","journal-title":"Adv. Space Res."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"112968","DOI":"10.1016\/j.rse.2022.112968","article-title":"Interference-sensitive coastal SAR altimetry retracking strategy for measuring significant wave height","volume":"274","author":"Schlembach","year":"2022","journal-title":"Remote Sens. Environ."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"348","DOI":"10.1080\/01490419.2010.487788","article-title":"Overview and update of the sea state bias corrections for the Jason-2, Jason-1 and TOPEX missions","volume":"33","author":"Tran","year":"2010","journal-title":"Mar. Geod."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1207","DOI":"10.5194\/os-15-1207-2019","article-title":"DUACS DT2018: 25 years of reprocessed sea level altimetry products","volume":"15","author":"Taburet","year":"2019","journal-title":"Ocean Sci."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Vignudelli, S., Kostianoy, A., Cipollini, P., and Benveniste, J. (2011). Coastal Altimetry, Springer.","DOI":"10.1007\/978-3-642-12796-0"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"911","DOI":"10.1109\/TGRS.2014.2330423","article-title":"SAR Altimeter Backscattered Waveform Model","volume":"53","author":"Ray","year":"2015","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1080\/01490419.2010.491033","article-title":"Relative performance of the MLE3 and MLE4 retracking algorithms on Jason-2 altimeter waveforms","volume":"33","author":"Thibaut","year":"2010","journal-title":"Mar. Geod."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1109\/TAP.1977.1141536","article-title":"The average impulse response of a rough surface and its applications","volume":"25","author":"Brown","year":"1977","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"687","DOI":"10.1109\/TAP.1980.1142398","article-title":"Radar altimeter mean return waveforms from near-normal-incidence ocean surface scattering","volume":"28","author":"Hayne","year":"1980","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"9927","DOI":"10.1109\/TGRS.2021.3064236","article-title":"Benefits of the Adaptive algorithm for retracking altimeter nadir echoes: Results from simulations and CFOSAT\/SWIM observations","volume":"59","author":"Tourain","year":"2021","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Schlembach, F., Passaro, M., Quartly, G.D., Kurekin, A., Nencioli, F., Dodet, G., Pioll\u00e9, J.F., Ardhuin, F., Bidlot, J., and Schwatke, C. (2020). Round Robin Assessment of Radar Altimeter Low Resolution Mode and Delay-Doppler Retracking Algorithms for Significant Wave Height. Remote Sens., 12.","DOI":"10.3390\/rs12081254"},{"key":"ref_24","unstructured":"Dinardo, S. (2020). Techniques and Applications for Satellite SAR Altimetry over Water, Land and Ice, Technische Universit\u00e4t Darmstadt."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2641","DOI":"10.1016\/j.asr.2015.02.014","article-title":"The German Bight: A validation of CryoSat-2 altimeter data in SAR mode","volume":"55","author":"Dinardo","year":"2015","journal-title":"Adv. Space Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1002\/gdj3.174","article-title":"GESLA Version 3: A major update to the global higher-frequency sea-level dataset","volume":"10","author":"Haigh","year":"2023","journal-title":"Geosci. Data J."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"C11013","DOI":"10.1029\/2008JC004756","article-title":"Estimates of sea surface height and near-surface alongshore coastal currents from combinations of altimeters and tide gauges","volume":"113","author":"Saraceno","year":"2008","journal-title":"J. Geophys. Res.-Space"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"35","DOI":"10.5194\/os-17-35-2021","article-title":"The Zone of Influence: Matching sea level variability from coastal altimetry and tide gauges for vertical land motion estimation","volume":"17","author":"Oelsmann","year":"2020","journal-title":"Ocean Sci."},{"key":"ref_29","first-page":"1275","article-title":"Modeling the barotropic response of the global ocean to atmospheric wind and pressure forcing-comparisons with observations","volume":"30","author":"Lyard","year":"2003","journal-title":"Geophys. Res. Lett."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1080\/01490410490902133","article-title":"Jason-1 altimeter ground processing look-up correction tables","volume":"27","author":"Thibaut","year":"2004","journal-title":"Mar. Geod."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Jiang, M., Xu, K., and Wang, J. (2022). Evaluation of Sentinel-6 Altimetry Data over Ocean. Remote Sens., 15.","DOI":"10.3390\/rs15010012"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"3812","DOI":"10.1038\/s41467-021-23982-4","article-title":"Global coastal attenuation of wind-waves observed with radar altimetry","volume":"12","author":"Passaro","year":"2021","journal-title":"Nat. Commun."},{"key":"ref_33","unstructured":"Dinardo, S., Cadier, E., Moreau, T., Maraldi, C., and Boy, F. (2023, August 21). Sentinel-6MF Poseidon-4 Main Result from the First Year of Mission from the S6PP LRM and UF-SAR Chain. Ocean Surface Topography Science Team (OSTST) Meeting, Online. Available online: https:\/\/ostst.aviso.altimetry.fr\/fileadmin\/user_upload\/OSTST2022\/Presentations\/S6VT2022-Sentinel-6-MF_Poseidon-4__Main_results_from_the_first_year_and_half_of_mission_from_the_S6PP_LRM_and_HRM_Chain.pdf."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"113517","DOI":"10.1016\/j.rse.2023.113517","article-title":"Benefits of fully focused SAR altimetry to coastal wave height estimates: A case study in the North Sea","volume":"289","author":"Schlembach","year":"2023","journal-title":"Remote Sens. Environ."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/17\/4161\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:38:23Z","timestamp":1760128703000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/17\/4161"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,8,24]]},"references-count":34,"journal-issue":{"issue":"17","published-online":{"date-parts":[[2023,9]]}},"alternative-id":["rs15174161"],"URL":"https:\/\/doi.org\/10.3390\/rs15174161","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,8,24]]}}}