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                              <gco:Date>2025-07-29</gco:Date>
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                              <gmx:Anchor xlink:href="https://sextant.ifremer.fr/geonetwork/srv/api/registries/vocabularies/external.parameter.NVS.P03">geonetwork.thesaurus.external.parameter.NVS.P03</gmx:Anchor>
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                     <gmd:title gco:nilReason="missing" xsi:type="lan:PT_FreeText_PropertyType">
                        <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/cersat_sensor">Cersat - Sensor</gmx:Anchor>
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                        <gmd:CI_Date>
                           <gmd:date>
                              <gco:Date>2025-12-09</gco:Date>
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                              <gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode"
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                        <gmd:MD_Identifier>
                           <gmd:code>
                              <gmx:Anchor xlink:href="https://sextant.ifremer.fr/geonetwork/srv/api/registries/vocabularies/local.theme.cersat_sensor">geonetwork.thesaurus.local.theme.cersat_sensor</gmx:Anchor>
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               <gmd:thesaurusName>
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                     <gmd:title gco:nilReason="missing" xsi:type="lan:PT_FreeText_PropertyType">
                        <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/cersat_platform">Cersat - Platform</gmx:Anchor>
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                           <gmd:date>
                              <gco:Date>2025-12-09</gco:Date>
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                              <gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode"
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               <gmd:thesaurusName>
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                     <gmd:title gco:nilReason="missing" xsi:type="lan:PT_FreeText_PropertyType">
                        <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/P07/current/">Climate and Forecast Standard Names</gmx:Anchor>
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                              <gco:Date>2017-04-04</gco:Date>
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                           <gmd:code>
                              <gmx:Anchor xlink:href="https://sextant.ifremer.fr/geonetwork/srv/api/registries/vocabularies/external.parameter.myocean.ocean-variables">geonetwork.thesaurus.external.parameter.myocean.ocean-variables</gmx:Anchor>
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               <gmd:otherConstraints xsi:type="lan:PT_FreeText_PropertyType">
                  <gco:CharacterString>Les conditions d'utilisation sont précisées sur la page suivante. L'accès aux données SAREDA [2002-2020] est possible après vous être enregistré : 
https://www.icare.univ-lille.fr/data-policy/?policy=sareda

Toute publication utilisant ce jeu de données SAREDA doit mentionner la provenance des données selon ce qui suit :
" Le jeu de données SAREDA a été fourni par le Centre de données et de services AERIS/ICARE. DOI : https://doi.org/10.12770/8fe1cdcb-f4ea-4c81-8543-50f0b39b4eca ". Faire référence aux articles suivants :
- Descloitres, J., Minghelli, A., Steinmetz, F., Chevalier, C., Chami, M., et Berline, L. (2021). Revisited Estimation of Moderate Resolution Sargassum Fractional Coverage Using Decametric Satellite Data (S2-MSI) (Estimation révisée de la couverture fractionnelle des sargasses à résolution modérée à l'aide de données satellitaires décamétriques). Remote Sens. 2021, 13, 5106. https://doi.org/10.3390/rs13245106
- Podlejski, W., Descloitres, J., Chevalier, C., Minghelli, A., Lett, C., et Berline, L. (2022). Filtering out false Sargassum detections using context features. Front. Mar. Sci. 9:960939. https://doi.org/10.3389/fmars.2022.960939</gco:CharacterString>
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                        <gmd:LocalisedCharacterString locale="#FR">Les conditions d'utilisation sont précisées sur la page suivante. L'accès aux données SAREDA [2002-2020] est possible après vous être enregistré : 
https://www.icare.univ-lille.fr/data-policy/?policy=sareda

Toute publication utilisant ce jeu de données SAREDA doit mentionner la provenance des données selon ce qui suit :
" Le jeu de données SAREDA a été fourni par le Centre de données et de services AERIS/ICARE. DOI : https://doi.org/10.12770/8fe1cdcb-f4ea-4c81-8543-50f0b39b4eca ". Faire référence aux articles suivants :
- Descloitres, J., Minghelli, A., Steinmetz, F., Chevalier, C., Chami, M., et Berline, L. (2021). Revisited Estimation of Moderate Resolution Sargassum Fractional Coverage Using Decametric Satellite Data (S2-MSI) (Estimation révisée de la couverture fractionnelle des sargasses à résolution modérée à l'aide de données satellitaires décamétriques). Remote Sens. 2021, 13, 5106. https://doi.org/10.3390/rs13245106
- Podlejski, W., Descloitres, J., Chevalier, C., Minghelli, A., Lett, C., et Berline, L. (2022). Filtering out false Sargassum detections using context features. Front. Mar. Sci. 9:960939. https://doi.org/10.3389/fmars.2022.960939</gmd:LocalisedCharacterString>
                     </gmd:textGroup>
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                        <gmd:LocalisedCharacterString locale="#EN">The conditions of use are specified on the following page, Access to the SAREDA dataset on the period [2002-2020] is available upon registration: 
https://www.icare.univ-lille.fr/data-policy/?policy=sareda

Any publication using the SAREDA data set must acknowledge the data provenance as follows:
« The SAREDA data set was provided by the AERIS/ICARE Data and Services Center. DOI : https://doi.org/10.12770/8fe1cdcb-f4ea-4c81-8543-50f0b39b4eca » and refer to the following articles:
- Descloitres, J., Minghelli, A., Steinmetz, F., Chevalier, C., Chami, M., and Berline, L. (2021). Revisited Estimation of Moderate Resolution Sargassum Fractional Coverage Using Decametric Satellite Data (S2-MSI). Remote Sens. 2021, 13, 5106. https://doi.org/10.3390/rs13245106
- Podlejski, W., Descloitres, J., Chevalier, C., Minghelli, A., Lett, C., and Berline, L. (2022). Filtering out false Sargassum detections using context features. Front. Mar. Sci. 9:960939. https://doi.org/10.3389/fmars.2022.960939</gmd:LocalisedCharacterString>
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            <gmd:MD_SpatialRepresentationTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_SpatialRepresentationTypeCode"
                                                  codeListValue="grid">grid</gmd:MD_SpatialRepresentationTypeCode>
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         <gmd:spatialResolution>
            <gmd:MD_Resolution>
               <gmd:equivalentScale>
                  <gmd:MD_RepresentativeFraction>
                     <gmd:denominator>
                        <gco:Integer/>
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               </gmd:equivalentScale>
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         <gmd:language>
            <gmd:LanguageCode codeList="http://www.loc.gov/standards/iso639-2/" codeListValue="fre"/>
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            <gmd:MD_CharacterSetCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_CharacterSetCode"
                                     codeListValue="utf8">utf8</gmd:MD_CharacterSetCode>
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         <gmd:topicCategory>
            <gmd:MD_TopicCategoryCode>oceans</gmd:MD_TopicCategoryCode>
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         <gmd:extent>
            <gmd:EX_Extent>
               <gmd:geographicElement>
                  <gmd:EX_GeographicBoundingBox>
                     <gmd:westBoundLongitude>
                        <gco:Decimal>-100.00</gco:Decimal>
                     </gmd:westBoundLongitude>
                     <gmd:eastBoundLongitude>
                        <gco:Decimal>15.00</gco:Decimal>
                     </gmd:eastBoundLongitude>
                     <gmd:southBoundLatitude>
                        <gco:Decimal>-15.00</gco:Decimal>
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                     <gmd:northBoundLatitude>
                        <gco:Decimal>50.00</gco:Decimal>
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                        <gml:TimePeriod gml:id="d12587563e718a1050910">
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                           <gml:endPosition>2020-12-31</gml:endPosition>
                        </gml:TimePeriod>
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            </gmd:EX_Extent>
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      </gmd:MD_DataIdentification>
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                        <gmd:CI_ResponsibleParty>
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                              <gmd:LocalisedCharacterString locale="#FR">DOI du jeu de données Sargasses</gmd:LocalisedCharacterString>
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                        <gco:CharacterString>DOI du jeu de données Sargasses</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#FR">DOI du jeu de données Sargasses</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#EN">DOI of the dataset Sargassum</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage xsi:type="lan:PT_FreeText_PropertyType">
                        <gmd:URL>https://www.icare.univ-lille.fr/asd-content/archive/?dir=MODIS/MOD-AFAI-D3.v1.21/</gmd:URL>
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                        <gco:CharacterString>WWW:DOWNLOAD</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name gco:nilReason="missing" xsi:type="lan:PT_FreeText_PropertyType">
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                              <gmd:LocalisedCharacterString locale="#FR">SAREDA products - MODIS Terra via https</gmd:LocalisedCharacterString>
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                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#EN">SAREDA products - MODIS Terra via https</gmd:LocalisedCharacterString>
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                        </gmd:PT_FreeText>
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               </gmd:onLine>
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                        <gmd:URL>https://www.icare.univ-lille.fr/asd-content/archive/?dir=MODIS/MYD-AFAI-D3.v1.21/</gmd:URL>
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                        <gco:CharacterString>WWW:DOWNLOAD</gco:CharacterString>
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                     <gmd:name gco:nilReason="missing" xsi:type="lan:PT_FreeText_PropertyType">
                        <gco:CharacterString>SAREDA products - MODIS Aqua via https</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#FR">SAREDA products - MODIS Aqua via https</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:name>
                     <gmd:description xsi:type="lan:PT_FreeText_PropertyType">
                        <gco:CharacterString>SAREDA products - MODIS Aqua via https</gco:CharacterString>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#FR">SAREDA products - MODIS Aqua via https</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#EN">SAREDA products - MODIS Aqua via https</gmd:LocalisedCharacterString>
                           </gmd:textGroup>
                        </gmd:PT_FreeText>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage xsi:type="lan:PT_FreeText_PropertyType">
                        <gmd:URL>https://www.icare.univ-lille.fr/asd-content/archive/?dir=MODIS/MCD-AFAI-D3.v1.21/</gmd:URL>
                        <gmd:PT_FreeText>
                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#FR">https://www.icare.univ-lille.fr/asd-content/archive/?dir=MODIS/MCD-AFAI-D3.v1.21/</gmd:LocalisedCharacterString>
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                        <gco:CharacterString>WWW:DOWNLOAD</gco:CharacterString>
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                        <gco:CharacterString>SAREDA products - MODIS Aqua + Terra via https</gco:CharacterString>
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                        <gco:CharacterString>SAREDA products - MODIS Aqua + Terra via https</gco:CharacterString>
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                              <gmd:LocalisedCharacterString locale="#FR">SAREDA products - MODIS Aqua + Terra via https</gmd:LocalisedCharacterString>
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                           <gmd:textGroup>
                              <gmd:LocalisedCharacterString locale="#EN">SAREDA products - MODIS Aqua + Terra via https</gmd:LocalisedCharacterString>
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
      </gmd:MD_Distribution>
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                                    codeListValue="dataset"/>
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               <gmd:statement xsi:type="lan:PT_FreeText_PropertyType">
                  <gco:CharacterString>L'algorithme SAREDA (SArgassum Evolving Distribution in the Atlantic) effectue une détection contextuelle des sargasses en utilisant l'indice alternatif d'algues flottantes (AFAI) (Wang et Hu, 2016). L'écart de l'indice AFAI par rapport au fond est utilisé pour récupérer la couverture de la zone en Sargasses, c'est-à-dire la fraction des pixels MODIS couverts par les Sargasses. Les composites quotidiens sur des grilles de 1 km et 5 km sont dérivés des acquisitions instantanées de MODIS-Terra et MODIS-Aqua.
Dans le cadre du projet SAREDA, supporté par le TOSCA-CNES et l’IRD, le MIO s’est associé au pôle AERIS et son centre de données et de services ICARE spécialisé dans l’exploitation massive des données spatiales d’observation de la Terre, pour le traitement de ces données. GeoID-OCEAN a contribué à la mise en place du prototype de la chaîne de traitement.

Références bibliographiques
- Descloitres, J.; Minghelli, A.; Steinmetz, F.; Chevalier, C.; Chami, M.; Berline, L. Revisited Estimation of Moderate Resolution Sargassum Fractional Coverage Using Decametric Satellite Data (S2-MSI). Remote Sens. 2021, 13, 5106. https://doi.org/10.3390/rs13245106 
- Podlejski, W.  et al. (2022) Filtering out false Sargassum detections using context features. Frontiers in Marine Science. 9:960939. https://doi.org/10.3389/fmars.2022.960939</gco:CharacterString>
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