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            <gco:CharacterString>L'État a confié à l'IGN le développement du référentiel à grande échelle (RGE). Pour ce faire, il fait appel à ses moyens propres ainsi qu’à des partenariats avec des producteurs principalement de la sphère publique. 

Le RGE est constitué de 5 composantes:
- orthophotographique (BD ORTHO), 
- topographique (BD TOPO),
- adresse (BD adresse), 
- parcellaire (BD parcellaire) 
- et altimétrique (RGE ALTI).

Remarque : seules les BD TOPO thème hydrographique, BD ORTHO 5m, BD ORTHO 50 cm sont sous Licence Ouverte. 
Les autres données du RGE sont soumises aux licences IGN.

-----
Etat de la disponibilité de la donnée (sous Licence Ouverte): 

- Data.gouv : les BD TOPO thème hydrographique, BD ORTHO 5m, BD ORTHO 50 cm (pour certains départements) sont accessibles sous format shape, xml et htlm. Mise à jour irrégulière. 

- PIGMA : données BD ORTHO 50 cm (2015) et BD TOPO v2.2 (2016) accessibles au format shape sous licence IGN. Aucune mise à jour.

- Géocatalogue : données BD ORTHO v2 (2013) au format Tif et BD TOPO v2.1 (2015) au format shape, MIF/MID accessibles sous licence IGN. Aucune mise à jour.

- IGN : renvoi direct au site IGN où les données sont téléchargeables au format JPEG et shape sous licence IGN. Mise à jour irrégulière.</gco:CharacterString>
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                        <gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>PIGMA - BD Ortho 50cm</gco:CharacterString>
                     </gmd:name>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://www.pigma.org/geonetwork/apps/georchestra/?uuid=b05e6f3d-3ad3-41f3-941f-23e6e04fcf89</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>PIGMA- BD Topo (thème hydro)</gco:CharacterString>
                     </gmd:name>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.geocatalogue.fr/Detail.do?fileIdentifier=01c922a8-75e5-4990-8ffa-34466652be28</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Géocatalogue - BD Ortho</gco:CharacterString>
                     </gmd:name>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.geocatalogue.fr/Detail.do?fileIdentifier=IGNF_BDTOPOr_2-1.xml</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>Géocatalogue - BD Topo (thème hydro)</gco:CharacterString>
                     </gmd:name>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
      </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:dataQualityInfo>
      <gmd:DQ_DataQuality>
         <gmd:scope>
            <gmd:DQ_Scope>
               <gmd:level>
                  <gmd:MD_ScopeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/ML_gmxCodelists.xml#MD_ScopeCode"
                                    codeListValue=""/>
               </gmd:level>
            </gmd:DQ_Scope>
         </gmd:scope>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement>
                  <gco:CharacterString>Produit par Institut national de l'information géographique et forestière (IGN-F).
La géométrie des objets de la BD TOPO® provient de sources différentes ; l'objet aura une précision relative à sa méthode d'acquisition. La restitution photogrammétrique permet d'obtenir une meilleure précision géométrique qu'avec un report à partir d'un plan, d'une orthophotographie, ou d'une autre base de données 2D telle que la BD CARTO®. La correspondance entre les sources de données et la valeur de la précision escomptée est fournie dans le document de référence. Les données attributaires proviennent de différentes sources. Pour une classe donnée, les sources de l'information sémantique et celles de l'information géométrique ne coïncident pas forcément. C'est pourquoi la notion de source de données a été précisée.</gco:CharacterString>
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         </gmd:lineage>
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  <gmd:metadataMaintenance>
      <gmd:MD_MaintenanceInformation>
         <gmd:maintenanceAndUpdateFrequency>
            <gmd:MD_MaintenanceFrequencyCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/ML_gmxCodelists.xml#MD_MaintenanceFrequencyCode"
                                             codeListValue="annually"/>
         </gmd:maintenanceAndUpdateFrequency>
         <gmd:dateOfNextUpdate>
            <gco:Date/>
         </gmd:dateOfNextUpdate>
      </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
</gmd:MD_Metadata>