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Des informations détaillées sur la méthodologie d'acquisition et de traitement des données acoustiques sont disponibles dans le guide des campagnes MEDIAS . De plus, des détails sur la méthode d'interpolation utilisée sont fournis dans le rapport de la 16ème réunion du groupe de travail.</gco:CharacterString>
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            <gmd:DQ_DomainConsistency>
               <gmd:evaluationProcedure/>
               <gmd:dateTime/>
               <gmd:result>
                  <gmd:DQ_ConformanceResult>
                     <gmd:specification>
                        <gmd:CI_Citation>
                           <gmd:title xsi:type="lan:PT_FreeText_PropertyType">
                              <gco:CharacterString>RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques</gco:CharacterString>
                              <gmd:PT_FreeText>
                                 <gmd:textGroup>
                                    <gmd:LocalisedCharacterString locale="#FR">RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques</gmd:LocalisedCharacterString>
                                 </gmd:textGroup>
                              </gmd:PT_FreeText>
                           </gmd:title>
                           <gmd:date>
                              <gmd:CI_Date>
                                 <gmd:date>
                                    <gco:Date>2010-12-08</gco:Date>
                                 </gmd:date>
                                 <gmd:dateType>
                                    <gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode"
                                                         codeListValue="publication">publication</gmd:CI_DateTypeCode>
                                 </gmd:dateType>
                              </gmd:CI_Date>
                           </gmd:date>
                        </gmd:CI_Citation>
                     </gmd:specification>
                     <gmd:explanation xsi:type="lan:PT_FreeText_PropertyType">
                        <gco:CharacterString>See the referenced specification</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#FR">See the referenced specification</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:explanation>
                     <gmd:pass>
                        <gco:Boolean>false</gco:Boolean>
                     </gmd:pass>
                  </gmd:DQ_ConformanceResult>
               </gmd:result>
            </gmd:DQ_DomainConsistency>
         </gmd:report>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement xsi:type="lan:PT_FreeText_PropertyType">
                  <gco:CharacterString>Des écho-sondeurs split-beam ont été utilisés pour l'acquisition des données acoustiques, fonctionnant à une fréquence de 38 kHz avec une durée d'impulsion de 1 ms. L'unité élémentaire d'échantillonnage de distance pour l'écho-intégration a été fixée à 1 mille nautique. Les logiciels Echoview et/ou Movies 3D ont été utilisés pour le prétraitement des données acoustiques et la réalisation de l'écho-intégration.
L'identification des échos reposait sur un échantillonnage des poissons au cours des campagnes à l'aide de chaluts pélagiques, permettant d'obtenir des échantillons représentatifs des populations de poissons. La partition des échos par espèce s'est basée sur l'examen visuel des écho-grammes, effectué soit par attribution directe grâce à l'identification d'échos individuels, soit par allocation basée sur des stations de pêche représentatives.
Pour l'interpolation spatiale des valeurs de NASC, la méthode de Pondération Inverse des Distances a été utilisée. Diverses valeurs des paramètres p (puissance utilisée dans la pondération) et n (nombre d'observations les plus proches utilisées pour l'estimation) ont été testées. Le résultat optimal a été obtenu avec p=2 et n=10. Enfin, pour améliorer la visibilité des motifs géographiques locaux sur la surface interpolée, l'échelle de couleurs a été élaborée en utilisant la méthode des "quantiles".</gco:CharacterString>
               </gmd:statement>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
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