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En chaque point du réseau sont mesurés des paramètres de l'eau. Chaque point est un lieu dit précis avec des repères fixes.
Titre et contenu des champs de la table attributaire :
- Localisation : nom du lieu dit du point de prélèvement d'eau et de mesure in situ
- Long_LII = longitude du point de mesure en Lambert II étendu
- Lat_LII = latitude idem
- Debut_mesure : année des premières mesures
- Fin_mesure : année des dernières mesures (vide = mesures toujours prévues)
- Debut_données = date de la première donnée disponible
- Fin_données = date de la dernière donnée disponible en date
- MES = matière en suspension (mesurée par néphélométrie)
- DBO5 = demande biologique en oxygène
- Nitrates = concentrations en NO3/NO4
- Ammonium = concentration en ion ammonium
-  Phosphate = concentration en PO4
- COT = carbone organique total
- E_coli = concentration en Escherichia coli
- Entérocoques = concentration en bactéries Entérococales
Tous ces paramètres sont mesurés dans des laboratoires sous accréditation sur un échantillon d'eau prélevé par point. Les résultats des mesures sont analysées par un système d'évaluation  de la qualité de l'eau par comparaison à une grille établie par l'ensemble des services des DDE des départements du littoral français. La grille utilisée pour les prélèvements en estuaires est celle des eaux saumâtres.
Les valeurs rapportées dans la table attributaire sont des valeurs établies à partir des données disponibles conformément à cette grille.
En plus de ces paramètres sont mesurés in situ = température, pH, conductivité/salinité, oxygène dissous
Fréquence des mesures : 7-8/an 1998-2001, 4/an depuis 2001
Les mesure in situ sont faites à l'aide de sondes.</gco:CharacterString>
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         <gmd:scope>
            <gmd:DQ_Scope>
               <gmd:level>
                  <gmd:MD_ScopeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode"
                                    codeListValue="dataset"/>
               </gmd:level>
            </gmd:DQ_Scope>
         </gmd:scope>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement>
                  <gco:CharacterString>Mesures effectuées par le service des eaux littorales de la DDE 17</gco:CharacterString>
               </gmd:statement>
               <gmd:processStep>
                  <gmd:LI_ProcessStep>
                     <gmd:description>
                        <gco:CharacterString>Transformation des coordonnées de Lambert II en WGS_84, établissement d'une valeur globale pour chaque point et chaque paramètre, d'après la grille qualité des DDE des départements du littoral français</gco:CharacterString>
                     </gmd:description>
                     <gmd:rationale>
                        <gco:CharacterString>Mise en évidence de points particuliers</gco:CharacterString>
                     </gmd:rationale>
                     <gmd:dateTime>
                        <gco:DateTime>2008-07-24T00:00:00</gco:DateTime>
                     </gmd:dateTime>
                     <gmd:processor>
                        <gmd:CI_ResponsibleParty>
                           <gmd:individualName>
                              <gco:CharacterString>HATT Philippe-Jacques</gco:CharacterString>
                           </gmd:individualName>
                           <gmd:organisationName>
                              <gco:CharacterString>Ifremer, station de La Rochelle - L'Houmeau</gco:CharacterString>
                           </gmd:organisationName>
                           <gmd:positionName>
                              <gco:CharacterString>cadre de recherche</gco:CharacterString>
                           </gmd:positionName>
                           <gmd:contactInfo>
                              <gmd:CI_Contact>
                                 <gmd:phone>
                                    <gmd:CI_Telephone>
                                       <gmd:voice>
                                          <gco:CharacterString>05 46 50 06 29</gco:CharacterString>
                                       </gmd:voice>
                                       <gmd:facsimile>
                                          <gco:CharacterString>05 46 50 06 60</gco:CharacterString>
                                       </gmd:facsimile>
                                    </gmd:CI_Telephone>
                                 </gmd:phone>
                                 <gmd:address>
                                    <gmd:CI_Address>
                                       <gmd:deliveryPoint>
                                          <gco:CharacterString>Place Gaby Coll</gco:CharacterString>
                                       </gmd:deliveryPoint>
                                       <gmd:city>
                                          <gco:CharacterString>L'Houmeau</gco:CharacterString>
                                       </gmd:city>
                                       <gmd:administrativeArea>
                                          <gco:CharacterString>Charente maritime</gco:CharacterString>
                                       </gmd:administrativeArea>
                                       <gmd:postalCode>
                                          <gco:CharacterString>17137</gco:CharacterString>
                                       </gmd:postalCode>
                                       <gmd:country>
                                          <gco:CharacterString>France</gco:CharacterString>
                                       </gmd:country>
                                       <gmd:electronicMailAddress>
                                          <gco:CharacterString>pjhatt@ifremer.fr</gco:CharacterString>
                                       </gmd:electronicMailAddress>
                                    </gmd:CI_Address>
                                 </gmd:address>
                              </gmd:CI_Contact>
                           </gmd:contactInfo>
                           <gmd:role>
                              <gmd:CI_RoleCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_RoleCode"
                                               codeListValue="publisher">publisher</gmd:CI_RoleCode>
                           </gmd:role>
                        </gmd:CI_ResponsibleParty>
                     </gmd:processor>
                  </gmd:LI_ProcessStep>
               </gmd:processStep>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:metadataConstraints>
      <gmd:MD_Constraints/>
  </gmd:metadataConstraints>
  <gmd:metadataConstraints>
      <gmd:MD_LegalConstraints>
         <gmd:otherConstraints>
            <gco:CharacterString>à usage non commercial</gco:CharacterString>
         </gmd:otherConstraints>
      </gmd:MD_LegalConstraints>
  </gmd:metadataConstraints>
  <gmd:metadataConstraints>
      <gmd:MD_SecurityConstraints>
         <gmd:classification>
            <gmd:MD_ClassificationCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ClassificationCode"
                                       codeListValue="unclassified"/>
         </gmd:classification>
      </gmd:MD_SecurityConstraints>
  </gmd:metadataConstraints>
  <gmd:metadataMaintenance>
      <gmd:MD_MaintenanceInformation>
         <gmd:maintenanceAndUpdateFrequency>
            <gmd:MD_MaintenanceFrequencyCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_MaintenanceFrequencyCode"
                                             codeListValue="annually"/>
         </gmd:maintenanceAndUpdateFrequency>
         <gmd:dateOfNextUpdate>
            <gco:Date>2009-07-24</gco:Date>
         </gmd:dateOfNextUpdate>
         <gmd:updateScope>
            <gmd:MD_ScopeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode"
                              codeListValue="dataset"/>
         </gmd:updateScope>
         <gmd:maintenanceNote>
            <gco:CharacterString>Conditionnée par les mesures effectuées par le service des eaux littorales de la DDE de Charente maritime</gco:CharacterString>
         </gmd:maintenanceNote>
      </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
</gmd:MD_Metadata>