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            <gco:CharacterString>Depuis 2007, trois sondes de mesure à haute fréquence fonctionnent dans le Pertuis breton. Les mesures sont faites toutes les 20 minutes.
Paramètres mesurés : température (°C) et salinité (PSU) et profondeur. Sondes de marque NKE.
La sonde placée dans le panache de la Sèvre niortaise et celle dans l'embouchure du Lay sont fixées sur un flotteur qui glisse le long d'un pieu. Elle sont à une profondeur maximale de 2 m.
La sonde placée au milieu des filières conchylicoles est fixée sous une bouée à une profondeur moyenne de 2m20.
Le nettoyage et le calibrage sont réalisées toutes les 2 à 4 semaines.
L'erreur de justesse et l'incertitude sont alors mesurées sur un banc d'étalonnage.

Méthodes de mesure : sondes (résistance, conductance, pressiostat)
Résolution des mesures : 1/100ème
Incertitude des mesures liée à la chaîne d'étalonnage : température = 0,2°C ; salinité 0,4g.L-1
Dérives constatées : voir sur les tableaux de données.
Exactitude mesurée : voir sur les tableaux de données.

La table attributaire comporte les valeurs suivantes :
- Long_WGS84 : longitude de la position de la sonde relevée au GPS, en coordonnées géographique WGS84
- Lat_WGS84 : latitude idem
- SalMoy_1a4_08 = salinité moyenne du 1er janvier au 28 avril 2008
- SatET_1a4-08 = 2*ecart-type des valeurs de salinité  du 1er janvier au 28 avril 2008
- SalMoy_5a6_08 = salinité moyenne du 29 avril au 30 juin 2008
- SatET_5a6-08 = 2*ecart-type des valeurs de salinité   du 29 avril au 30 juin 2008
- TempMoy_1a4_08 = température moyenne du 1er janvier au 28 avril 2008
- TempET_1a4-08 = 2*ecart-type des valeurs de température  du 1er janvier au 28 avril 2008
- TempMoy_5a6_08 = température moyenne du 29 avril au 30 juin 2008
- TempET_5a6-08 = 2*ecart-type des valeurs de température du 29 avril au 30 juin 2008</gco:CharacterString>
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                  <gco:CharacterString>Sonde conductimétrie, Sonde thermistance</gco:CharacterString>
               </gmd:measureDescription>
               <gmd:evaluationProcedure/>
               <gmd:dateTime/>
               <gmd:result/>
               <gmd:result/>
            </gmd:DQ_QuantitativeAttributeAccuracy>
         </gmd:report>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement>
                  <gco:CharacterString>Ifremer/DOP/LER/PC réseau de mesure d'hydrologie</gco:CharacterString>
               </gmd:statement>
               <gmd:processStep>
                  <gmd:LI_ProcessStep>
                     <gmd:description>
                        <gco:CharacterString>Néant</gco:CharacterString>
                     </gmd:description>
                  </gmd:LI_ProcessStep>
               </gmd:processStep>
               <gmd:source>
                  <gmd:LI_Source>
                     <gmd:description>
                        <gco:CharacterString>GPS</gco:CharacterString>
                     </gmd:description>
                     <gmd:sourceReferenceSystem>
                        <gmd:MD_ReferenceSystem>
                           <gmd:referenceSystemIdentifier>
                              <gmd:MD_Identifier>
                                 <gmd:code>
                                    <gco:CharacterString>4326</gco:CharacterString>
                                 </gmd:code>
                              </gmd:MD_Identifier>
                           </gmd:referenceSystemIdentifier>
                        </gmd:MD_ReferenceSystem>
                     </gmd:sourceReferenceSystem>
                  </gmd:LI_Source>
               </gmd:source>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:metadataConstraints>
      <gmd:MD_LegalConstraints>
         <gmd:otherConstraints>
            <gco:CharacterString>à usage non commercial</gco:CharacterString>
         </gmd:otherConstraints>
      </gmd:MD_LegalConstraints>
  </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="asNeeded"/>
         </gmd:maintenanceAndUpdateFrequency>
      </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
</gmd:MD_Metadata>