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            <gco:CharacterString>Produit de hauteurs de mer destiné à l’étude de 29 régions côtières, avec des données le long de la trace projetées sur la trace de référence avec un intervalle d'environ 6-7 km entre les points (1 seconde). Concerne les missions Topex/Jason-1/Jason-2/Jason-3 (+ orbites intercalées pour Topex, Jason-1, Jason-2, Jason-3), ERS-1, ERS-2, Envisat, SARAL/AltiKa, Geosat Follow On, HaiYang-2A, HaiYang-2B, Sentinel-3A, Sentinel-3B et Sentinel-6A.

Les séries temporelles des anomalies du niveau de la mer ont été calculées avec le système de traitement spécifique pour le côtier, X-TRACK (développé au CTOH/LEGOS), à partir des produits Level 2 Plus (L2P) distribués par le CDS-AVISO. Le produit X-TRACK L2P est également plus complet puisqu'en plus des anomalies de hauteur de mer, il contient la hauteur significative des vagues et le coefficient de rétrodiffusion. Les corrections altimétriques appliquées sont celles présentes dans le produit.

Cet outil est basé sur:

− L’utilisation de nouveaux algorithmes de correction de la mesure pour éliminer ou réduire les effets dus à la présence du continent sur la mesure et les corrections, avec notamment, une procédure de sélection, de reconstruction et de lissage de corrections. Cette procédure consiste à définir un « critère d'editing » (i.e. l’ensemble de valeurs min et/ou max qui garantissent l’élimination de la plupart des mesures aberrantes) plus restrictif que le critère standard. Dans un second temps, une procédure statistique de contrôle qualité permet l’élimination de données aberrantes résiduelles. En parallèle, une méthode de reconstruction/lissage de corrections défaillantes par polynômes de Bézier est réalisée.

Cette approche permet de récupérer un nombre significatif de mesures altimétriques proches des côtes.

L'apport par rapport aux traitements standards est:

− Une diminution du taux de mesures erronées,

− Une augmentation de la couverture en zone côtière.</gco:CharacterString>
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Birol, F., N. Fuller, F. Lyard, M. Cancet, F. Niño, C. Delebecque, S. Fleury, et al. 2016. “Coastal Applications from Nadir Altimetry: Example of the X-TRACK Regional Products.” Advances in Space Research, November. doi:10.1016/j.asr.2016.11.005.</gco:CharacterString>
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                                                codeListValue="dataset"/>
                           </gmd:level>
                        </gmd:MD_Scope>
                     </gmd:scope>
                  </gmd:LI_ProcessStep>
               </gmd:processStep>
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                        <gco:CharacterString>v2.1</gco:CharacterString>
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                              <gmd:LocalisedCharacterString locale="#FR">v2.1</gmd:LocalisedCharacterString>
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                     <gmd:dateTime>
                        <gco:DateTime>V2.1 2022-07-10</gco:DateTime>
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                           <gmd:level>
                              <gmd:MD_ScopeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode"
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                        <gco:CharacterString>The improvements of the V2.2 compared to previous v2.1 version are: Software improvement, Addition of new missions (S6A, J3N, HY2-B, S3B), Temporal extension of the time series, Addition of 2 new coastal zones (Hawaii and French Polynesia).</gco:CharacterString>
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                              <gmd:LocalisedCharacterString locale="#FR">The improvements of the V2.2 compared to previous v2.1 version are: Software improvement, Addition of new missions (S6A, J3N, HY2-B, S3B), Temporal extension of the time series, Addition of 2 new coastal zones (Hawaii and French Polynesia).</gmd:LocalisedCharacterString>
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                        <gco:DateTime>V2.2 2025-06-19</gco:DateTime>
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                        <gmd:MD_Scope>
                           <gmd:level>
                              <gmd:MD_ScopeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode"
                                                codeListValue="dataset"/>
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                        </gmd:MD_Scope>
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