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            <gco:CharacterString>Ces produits fournissent les 4 paramètres suivants et leurs incertitudes :
- radar-freeboard,
- ice-freeboard
- épaisseur de la neige et
- épaisseur de la glace de mer,
L'objectif principal est de fournir l'épaisseur de la glace de mer (SIT pour Sea Ice Thickness), une variable climatique essentielle (ECV). La SIT dépend elle-même du freeboard de la glace de mer (FB), de l'épaisseur de la neige (SD pour Snow Depth), et de leurs densités par rapport à la densité de l'eau. Le FB et le SD peuvent être mesurés par altimétrie.
Le FB peut être mesuré par un seul altimètre [Laxon et al., 2013] alors que la mesure du SD est basée sur l'altimétrie bi-fréquence.
La solution pour estimer le SD repose sur l'altimètre CryoSat-2 Ku et l'altimètre Saral Ka [Guerreiro et al., 2016]. L'épaisseur de neige est donc limitée par l'orbite plus basse du satellite (en dessous de 81.5°N/S pour Saral) et la période de couverture commune (à partir de 2013 pour Saral). 

Pour chaque produit, les données sont fournies sur une base mensuelle et sur une grille EASE2 avec une résolution de 12,5 km pour tous les mois d'hiver (novembre-avril pour l'Arctique et mai-octobre pour l'Antarctique). Pour assurer une meilleure cohérence, un filtre de lissage est appliqué pour chaque cellule de la grille où le masque indique la présence de glace de mer. Deux versions de ces produits sont livrées, avec respectivement un rayon de filtrage de 25 km et de 50 km.

References:
 * Pour Envisat et CryoSat-2 FB et SIT :
- Guerreiro, K., Fleury, S., Zakharova, E., Kouraev, A., Rémy, F., Maisongrande, P., 2017. Comparison of CryoSat-2 and ENVISAT radar freeboard over Arctic sea ice: toward an improved Envisat freeboard retrieval. The Cryosphere 11, 2059–2073. https://doi.org/10.5194/tc-11-2059-2017 

* Pour la hauteur de neige : 
- Garnier, F., Fleury, S., Garric, G., Bouffard, J., Tsamados, M., Laforge, A., Bocquet, M., Fredensborg Hansen, R. M., and Rémy, F.: Advances in altimetric snow depth estimates using bi-frequency SARAL/CryoSat-2 Ka/Ku measurements, The Cryosphere Discuss. [preprint], https://doi.org/10.5194/tc-2021-79 , in review, 2021.
- Guerreiro, K., Fleury, S., Zakharova, E., Rémy, F., Kouraev, A., 2016. Potential for estimation of snow depth on Arctic sea ice from CryoSat-2 and SARAL/AltiKa missions. Remote Sensing of Environment 186, 339–349. https://doi.org/10.1016/j.rse.2016.07.013</gco:CharacterString>
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                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
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                     <gmd:name>
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                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#CI_OnLineFunctionCode"
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                        <gmd:URL>https://tds-odatis.aviso.altimetry.fr/thredds/catalog/dataset-auxilary-seaice-ctoh/ease2_grids_12500_smth50000/catalog.html</gmd:URL>
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                  <gmd:CI_OnlineResource>
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                        <gmd:URL>https://tds-odatis.aviso.altimetry.fr/thredds/catalog/dataset-auxilary-seaice-ctoh/ease2_grids_12500_smth25000/catalog.html</gmd:URL>
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                        <gco:CharacterString>WWW:LINK</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Sea Ice Freeboard, Thickness and Snow Depth Smoothing radius 25 km</gco:CharacterString>
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                     <gmd:description xsi:type="lan:PT_FreeText_PropertyType">
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                        <gmd:PT_FreeText>
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                              <gmd:LocalisedCharacterString locale="#FR">THREDDS</gmd:LocalisedCharacterString>
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                           <gmd:textGroup>
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                                                   codeListValue="download"/>
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               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
      </gmd:MD_Distribution>
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            <gmd:DQ_Scope>
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