{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T15:01:47Z","timestamp":1761663707639,"version":"build-2065373602"},"reference-count":20,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2018,1,11]],"date-time":"2018-01-11T00:00:00Z","timestamp":1515628800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Initially developed to monitor the performance of TOPEX\/Poseidon and to follow the Jason legacy satellite altimeters at Senetosa Cape, Corsica, this calibration\/validation site has been extended to include a new location at Ajaccio. This addition enables the site to monitor Envisat and ERS missions, CryoSat-2 and, more recently, the SARAL\/AltiKa mission and Sentinel-3A satellites. Sentinel-3A and CryoSat-2 carry altimeters that use a synthetic aperture radar (SAR) mode that is different to the conventional pulse-bandwidth limited altimeters often termed \u201clow resolution mode\u201d (LRM). The aim of this study is to characterize the sea surface height (SSH) bias of the new SAR altimeter instruments and to demonstrate the improvement of data quality close to the coast. Moreover, some passes of Sentinel-3A and CryoSat-2 overfly both Senetosa and Ajaccio with only a few seconds time difference, allowing us to evaluate the reliability and homogeneity of both ground sites in term of geodetic datum. The Sentinel-3A and CryoSat-2 SSH biases for the SAR mode are respectively +22 \u00b1 7 mm and \u221273 \u00b1 5 mm (for CryoSat-2 baseline C products). The results show that the stability of the SAR SSH bias time series is better than standard LRM altimetry. Moreover, compared to standard LRM data, for which the measurements closer than ~10 km from the coast were generally unusable, SAR mode altimeters provide measurements that are reliable at less than few hundred meters from the coast.<\/jats:p>","DOI":"10.3390\/rs10010092","type":"journal-article","created":{"date-parts":[[2018,1,11]],"date-time":"2018-01-11T13:36:15Z","timestamp":1515677775000},"page":"92","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Calibrating the SAR SSH of Sentinel-3A and CryoSat-2 over the Corsica Facilities"],"prefix":"10.3390","volume":"10","author":[{"given":"Pascal","family":"Bonnefond","sequence":"first","affiliation":[{"name":"SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universit\u00e9s, UPMC University Paris 06, LNE, 75014 Paris, France"}]},{"given":"Olivier","family":"Laurain","sequence":"additional","affiliation":[{"name":"G\u00e9oazur, Observatoire de la C\u00f4te d\u2019Azur, 06905 Sophia-Antipolis CEDEX, France"}]},{"given":"Pierre","family":"Exertier","sequence":"additional","affiliation":[{"name":"G\u00e9oazur, Observatoire de la C\u00f4te d\u2019Azur, 06905 Sophia-Antipolis CEDEX, France"}]},{"given":"Fran\u00e7ois","family":"Boy","sequence":"additional","affiliation":[{"name":"Centre National d\u2019Etudes Spatiales (CNES), 31401 Toulouse CEDEX, France"}]},{"given":"Thierry","family":"Guinle","sequence":"additional","affiliation":[{"name":"Centre National d\u2019Etudes Spatiales (CNES), 31401 Toulouse CEDEX, France"}]},{"given":"Nicolas","family":"Picot","sequence":"additional","affiliation":[{"name":"Centre National d\u2019Etudes Spatiales (CNES), 31401 Toulouse CEDEX, France"}]},{"given":"Sylvie","family":"Labroue","sequence":"additional","affiliation":[{"name":"Collecte Localisation Satellites (CLS), 31520 Ramonville Saint-Agne, France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4535-5556","authenticated-orcid":false,"given":"Matthias","family":"Raynal","sequence":"additional","affiliation":[{"name":"Collecte Localisation Satellites (CLS), 31520 Ramonville Saint-Agne, France"}]},{"given":"Craig","family":"Donlon","sequence":"additional","affiliation":[{"name":"European Space Agency\/European Space Research and Technology Centre (ESA\/ESTEC), 2201 AZ Noordwijk, The Netherlands"}]},{"given":"Pierre","family":"F\u00e9m\u00e9nias","sequence":"additional","affiliation":[{"name":"European Space Agency\/European Space Research Institute (ESA\/ESRIN), 00044 Frascatti, Italy"}]},{"given":"Tommaso","family":"Parrinello","sequence":"additional","affiliation":[{"name":"European Space Agency\/European Space Research Institute (ESA\/ESRIN), 00044 Frascatti, Italy"}]},{"given":"Salvatore","family":"Dinardo","sequence":"additional","affiliation":[{"name":"HeSpace, 64293 Darmstadt, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2018,1,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"261","DOI":"10.1080\/714044521","article-title":"Absolute Calibration of Jason-1 and TOPEX\/Poseidon Altimeters in Corsica Special Issue on Jason-1 Calibration\/Validation","volume":"26","author":"Bonnefond","year":"2003","journal-title":"Mar. 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