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                        <gco:Decimal>44.333972169366</gco:Decimal>
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                        <gco:Decimal>44.575671388116</gco:Decimal>
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            </gmd:EX_Extent>
         </gmd:extent>
         <gmd:supplementalInformation>
            <gco:CharacterString>Table attributaire : "ZONE" nom de la région, "TYPE" différents habitats rencontrés, "DATE" date de validation "IMAGE" date de l'image source,"METHODE" validation terrain ou photo-interprétation</gco:CharacterString>
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            <gco:Boolean>true</gco:Boolean>
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                                             codeListValue=""/>
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               <gmd:name>
                  <gco:CharacterString>Shp</gco:CharacterString>
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                  <gco:CharacterString>1.0</gco:CharacterString>
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         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.littoral-aquitain.fr/</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>site du Littoral Aquitain</gco:CharacterString>
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            <gmd:DQ_Scope>
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               <gmd:extent>
                  <gmd:EX_Extent>
                     <gmd:description>
                        <gco:CharacterString>Le traitement s'étend sur différents sites de la côte Aquitaine</gco:CharacterString>
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                  <gco:CharacterString>Géoréférencement sous ENVI@RSI 5,0 des images Pléiades de la Recette en vol Thématique Utilisateur (CNES). La cartographie de l'occupation du sol repose sur un arbre de décision qui incorpore deux descripteurs principaux: un NDVI de printemps (avril 2013) pour délimiter correctement la dune grise  et une image de variance indépendante (août 2012) pour différencier la dune blanche de la plage. Cette stratégie permet de cartographier les faciès suivants: plage (humide et sèche), dune blanche, dune grise, dune grise boisée et fôret. La validation menée sur 1 million et demi de pixels montre une précision moyenne de 91,6% sur la zone de La Salie. La recommandation est faite d'utiliser de préférence deux images prises la même année (ex. printemps et automne de la même année) afin d'éviter d'incorporer des changements qui auraient pu se produire entre les prises de vue. Un shape de polygones représentant les différentes classes d'occupation du sol et un shape de lignes représentant les différentes limites sont générés sous ArcGis. Une version simplifiée de l'algorithme de classification existe pour mettre en évidence les dégats de tempêtes sur les espaces végétalisés. Celui-ci consiste en une analyse NDVI d'images acquises à des dates successives qui mettent en valeur les terrains perdus et/ou couvert par du sable après une tempête ainsi que les étapes de reconstruction du couvert. Cet algorithme est appliqué aux images de la pointe d'Arçay. Un shape de polygones représentant les couverts végétalisés et les évolutions en fonction des années sont générés sous ArcGis.</gco:CharacterString>
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                  <gmd:LI_Source>
                     <gmd:description>
                        <gco:CharacterString>Source : qui a constitué la donnée ?</gco:CharacterString>
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