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                                <gco:CharacterString>Guide de téléchargement</gco:CharacterString>
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                            <gmd:description>
                                <gco:CharacterString>Comment télécharger des données images sur la plateforme Open Data information géographique Grand Est ?</gco:CharacterString>
                            </gmd:description>
                        </gmd:CI_OnlineResource>
                    </gmd:onLine>
                    <gmd:onLine>
                        <gmd:CI_OnlineResource>
                            <gmd:name>
                                <gco:CharacterString>Visualisation du fichier de dallage</gco:CharacterString>
                            </gmd:name>
                            <gmd:description>
                                <gco:CharacterString>Visualisation du dallage de l'orthophotographie</gco:CharacterString>
                            </gmd:description>
                            <gmd:linkage>
                                <gmd:URL>https://www.datagrandest.fr/mapfishapp/?noheader&amp;wmc=https://www.datagrandest.fr/metadata/geograndest/FR-200052264_GGE_IGNF_BDORTHORVB_D08-2016/Dalle_ortho_08.wmc</gmd:URL>
                            </gmd:linkage>
                            <gmd:protocol>
                                <gco:CharacterString>WWW:LINK-1.0-http--link</gco:CharacterString>
                            </gmd:protocol>
                        </gmd:CI_OnlineResource>
                    </gmd:onLine>
                    <gmd:onLine>
                        <gmd:CI_OnlineResource>
                            <gmd:name>
                                <gco:CharacterString>Fichier de mosaïquage</gco:CharacterString>
                            </gmd:name>
                            <gmd:description>
                                <gco:CharacterString>Couche SIG (format ShapeFile) générée pour le graphe de mosaïquage des orthophotos, avec la date des prise de vue</gco:CharacterString>
                            </gmd:description>
                            <gmd:linkage>
                                <gmd:URL>ftp://odgeo.grandest.fr/open_data/ORTHOPUB/ORTHO_RVB_0M20_JP2_E100_L93_D08_2016/catalog/D08_Mosaique_2016.zip</gmd:URL>
                            </gmd:linkage>
                            <gmd:protocol>
                                <gco:CharacterString>WWW:DOWNLOAD-1.0-http--download</gco:CharacterString>
                            </gmd:protocol>
                        </gmd:CI_OnlineResource>
                    </gmd:onLine>
                    <gmd:onLine>
                        <gmd:CI_OnlineResource>
                            <gmd:linkage>
                                <gmd:URL>https://www.datagrandest.fr/geoserver/geograndest/wfs</gmd:URL>
                            </gmd:linkage>
                            <gmd:protocol>
                                <gco:CharacterString>OGC:WFS</gco:CharacterString>
                            </gmd:protocol>
                            <gmd:description>
                                <gco:CharacterString>Couche WFS du dallage de l'orthophotographie</gco:CharacterString>
                            </gmd:description>
                            <gmd:name>
                                <gco:CharacterString>Dep_08_dalle_ortho</gco:CharacterString>
                            </gmd:name>
                        </gmd:CI_OnlineResource>
                    </gmd:onLine>
                    <gmd:onLine>
                        <gmd:CI_OnlineResource>
                            <gmd:linkage>
                                <gmd:URL>https://www.datagrandest.fr/metadata/geograndest/FR-200052264_GGE_IGNF_BDORTHORVB_D08-2016/Dep_08_dalle_ortho.zip</gmd:URL>
                            </gmd:linkage>
                            <gmd:protocol>
                                <gco:CharacterString>WWW:DOWNLOAD-1.0-http--download</gco:CharacterString>
                            </gmd:protocol>
                            <gmd:description>
                                <gco:CharacterString>Fichier de dallage au format Shapefile</gco:CharacterString>
                            </gmd:description>
                            <gmd:name>
                                <gco:CharacterString>Fichier de dallage</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 codeListValue="dataset" codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/ML_gmxCodelists.xml#MD_ScopeCode">dataset</gmd:MD_ScopeCode>
                    </gmd:level>
                </gmd:DQ_Scope>
            </gmd:scope>
            <gmd:report>
                <gmd:DQ_DomainConsistency>
                    <gmd:result>
                        <gmd:DQ_ConformanceResult>
                            <gmd:specification>
                                <gmd:CI_Citation>
                                    <gmd:date>
                                        <gmd:CI_Date>
                                            <gmd:dateType>
                                                <gmd:CI_DateTypeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/ML_gmxCodelists.xml#CI_DateTypeCode"/>
                                            </gmd:dateType>
                                        </gmd:CI_Date>
                                    </gmd:date>
                                </gmd:CI_Citation>
                            </gmd:specification>
                        </gmd:DQ_ConformanceResult>
                    </gmd:result>
                </gmd:DQ_DomainConsistency>
            </gmd:report>
            <gmd:lineage>
                <gmd:LI_Lineage>
                    <gmd:statement>
                        <gco:CharacterString>L'orthophotographie à 20cm est réalisée à partir de prises de vues à 25cm de résolution.
                            Le nombre de clichés nécessaires pour couvrir un département est de l'ordre de 600 à 1300. L'aspect radiométrique d'un département résulte donc d'un compromis sur l'ensemble des clichés nédessaires à sa couverture. La hauteur de soleil reste toujours supérieure à 30°. La qualité des images numérique est améliorée par les traitements radiométriques suivants:
                            - réduction des anomalies de contraste et de couleur liées à l'angle d'incidence des rayons solaires, aux conditions atmosphériques et à l'objectif photographique
                            - égalisation radiométrique sur l'ensemble des images de chaque département
                            - rehaussement global en couleur après orthorectification de chaque bloc.
                            Produit par Institut national de l'information géographique et forestière (IGN-F).

                            En mode optimisé, la compression JPEG2000 se fait au taux de compression nominal de 20. Le taux réel de compression est choisi pour qu'aucune différence de colorimétrie ne soit visible au zoom 1 (c’est-à -dire à l’affichage optimal des données en fonction de leur résolution) entre l'image non compressée et l'image compressée. La colorimétrie est ainsi globalement conservée avec en particulier l’absence de création de couleurs parasites, de flou et de perte d’information visible. Cette compression ne dégrade pas la géométrie.</gco:CharacterString>
                    </gmd:statement>
                </gmd:LI_Lineage>
            </gmd:lineage>
        </gmd:DQ_DataQuality>
    </gmd:dataQualityInfo>
</gmd:MD_Metadata>