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                <gco:CharacterString>1 place Adrien Zeller
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                    <gco:CharacterString>SAINT-MANDE Cedex</gco:CharacterString>
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          <gmd:description>
            <gco:CharacterString>Alsace</gco:CharacterString>
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          <gmd:geographicElement>
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              <gmd:westBoundLongitude>
                <gco:Decimal>8.27</gco:Decimal>
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              <gmd:eastBoundLongitude>
                <gco:Decimal>6.91</gco:Decimal>
              </gmd:eastBoundLongitude>
              <gmd:southBoundLatitude>
                <gco:Decimal>48.08</gco:Decimal>
              </gmd:southBoundLatitude>
              <gmd:northBoundLatitude>
                <gco:Decimal>49.10</gco:Decimal>
              </gmd:northBoundLatitude>
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        </gmd:EX_Extent>
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      <gmd:distributionFormat>
        <gmd:MD_Format>
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            <gco:CharacterString>ECW</gco:CharacterString>
          </gmd:name>
          <gmd:version>
            <gco:CharacterString>2.0</gco:CharacterString>
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          <gmd:specification>
            <gco:CharacterString>Enhanced Compression Wavelet (ECW)</gco:CharacterString>
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        </gmd:MD_Format>
      </gmd:distributionFormat>
      <gmd:transferOptions>
        <gmd:MD_DigitalTransferOptions>
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            <gmd:CI_OnlineResource>
              <gmd:linkage>
                <gmd:URL>http://www.geograndest.fr/geoserver/wms</gmd:URL>
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              <gmd:protocol>
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              <gmd:name>
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              <gmd:description>
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          </gmd:onLine>
          <gmd:onLine>
            <gmd:CI_OnlineResource>
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                <gmd:URL>http://www.geograndest.fr/mapfishapp/contexts/Orthophotographie.wmc</gmd:URL>
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              <gmd:protocol>
                <gco:CharacterString>OGC:WMC</gco:CharacterString>
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        </gmd:MD_DigitalTransferOptions>
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            <gco:CharacterString>La radiométrie de chaque pixel est codé en RVB sur 3 octets (24bits - 16 millions de couleurs). Des discontinuités plannimétriques de l'ordre de l'exactitude peuvent apparaître le long des lignes de mosaïquage. Cela se traduit par l'absence ou la duplication d'une partie du terrain. Les zones de sursol (bâti, pont, végétation, etc.) ne sont pas corrigées par l'orthorectification.Seuls les viaducs sont repris par procédé infographique. Les espaces agricoles ou naturels, les surfaces hydrographiques et les zones de mer ne font l'objet d'aucun traitement particulier.
Méthodologie: Les films aériens originaux sont scannés sur des scanneurs photogrammétriques (précision géométrique d'acquisition meilleure que 2 micons. Le nombre de clichés nécessaire à la couverture d'une département ne permet pas un parfait raccord radiométrique entre les dalles. Les conditions météorologiques conduisent généralement à effectuer les prises de vue par bloc indépendants. La qualité est améliorée par les traitements suivants : égalisation radiométrique sur l'ensemble des images de chaque bloc pour réduire les anomalies de contraste et couleur ainsi qu'un réhaussement global des couleurs de chaque bloc. Les zones interdites ou sans données sont remplacées par une radiométrie uniforme blanche.
Données sources: La prise de vue départementale se fait en couleur. L'échelle moyenne est de 1/25000. La chambre de prise de vues analogique a une focale de 152mm (+ ou - 2mm). Le recouvrement longitudinal est de 60% (+ ou - 5%). Le recouvrement latéral est de 20% (+ ou - 5%). La trajectographie est établie par GPS sur la chambre couleur. Le MNT utilisé est celui de la BDTOPO ou de la BD ALTI selon le territoire, grille régulière au pas de 25cm. L'exactitude du MNT est généralement meilleure que la 1/2 équidistance des courbes de niveau ayant servi à sa constitution (variant de 1,2m pour une eqd. de 5m à 9,3m pour une eqd de 40m). Pour les zones frontalières, des MNT étrangers ont pu être utilisés, leur qualité étant variable selon les pays. les meilleurs points d'appui terrain pris de l'IGN sont également utilisés (repiquage de mission BDTOPO et de moyenne échelle ayant une exactitude planimétrique de 0,8 à 5m).</gco:CharacterString>
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        </gmd:LI_Lineage>
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