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            <gco:CharacterString>Le produit Surval "Données par paramètre" met à disposition les données d'observation et de surveillance bancarisées dans Quadrige, validées et qui ne sont pas sous moratoire.

Ce système d'information contient des résultats sur la plupart des paramètres physiques, chimiques et biologiques de description de l'environnement. Les premières données datent par exemple de 1974 pour les paramètres de la qualité générale des eaux et les contaminants, 1987 pour le phytoplancton et les phycotoxines, 1989 pour la microbiologie, du début des années 2000 pour le benthos. 

Les données sous moratoire ou les données qualifiées "Faux" sont exclus de la diffusion Surval. Une donnée validée dans Quadrige aujourd’hui sera disponible dans Surval demain. Par contre, les fichiers associés à la donnée ne sont pas disponibles dans Surval.

L'accès aux données d'observation se fait par lieu. Un lieu de surveillance est un lieu géographique où des observations, des mesures et/ou des prélèvements sont effectués. Il est localisé de façon unique par son emprise cartographique (surface, ligne ou point). Un lieu de mesure peut être utilisé par plusieurs programmes d'observation et de surveillance.

Conformément aux exigences de l’ « Open data », toutes les données validées sans moratoire sont diffusées à J+1 et sans traitement. Ainsi tous les paramètres et tous les programmes Quadrige sont diffusés, et regroupés sous forme de thème :
- Benthos dont récifs coralliens
- Contaminants chimiques et Écotoxicologie
- Déchets marins
- Microbiologie
- Phytoplancton, hydrologie et phycotoxines
- Suivi du cycle de vie du bivalve
- Zooplancton
- Autres

Un thème regroupe un ou plusieurs programmes d'acquisition. Un programme correspond à une mise en œuvre d'un protocole, sur une période et un ensemble de lieux. Chaque programme est placé sous la responsabilité d'un animateur. 

Pour accompagner le résultat, de nombreuses données sont diffusées (téléchargeables en tant que données d’observation), comme :
- la description complète du « Paramètre-Support-Fraction-Méthode-Unité »;
- la description complète des « Passages », « Prélèvements » et « Échantillons »;
- le niveau de qualification du résultat;
- une proposition de citation, afin d’identifier tous les organismes contribuant à cette observation.

Ces données sont décrites plus précisément sur la page suivante https://surval.ifremer.fr/Astuces/Telechargement-contenu-du-fichier-csv 

L'emprise géographique est nationale : la métropole et les départements et régions d'outre-mer.

L'accès au téléchargement direct du jeu de données complet (~ 220 Mo) s'effectue par ce lien :
https://sextant.ifremer.fr/documentation/surveillance_littorale/surval/data/surval.zip ou https://www.data.gouv.fr/fr/datasets/donnees-par-parametre/

L'accès par le site Quadrige-Surval (https://surval.ifremer.fr/Les-produits/Donnees-par-parametre) permet de configurer des extractions et des graphes de visualisation sur demande (email demandé pour le téléchargement).

Pour en savoir plus : le vocabulaire employé sur ce site et dans les fichiers extraits est explicité dans des documents comme le manuel Quadrige web ; les thématiques sont plus détaillées dans les consignes thématiques au utilisateurs. https://quadrige.ifremer.fr/support/Mon-support-Quadrige/Je-consulte-les-manuels

Le DOI faisant référence à ce jeu de données chez le producteur est https://doi.org/10.12770/cf5048f6-5bbf-4e44-ba74-e6f429af51ea</gco:CharacterString>
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                              <gco:Date>2025-12-09</gco:Date>
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                        <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/dcsmm-methode">DCSMM : Méthodes de recueil des données</gmx:Anchor>
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                              <gco:Date>2025-12-09</gco:Date>
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                              <gco:Date>2025-12-09</gco:Date>
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                        <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/simm.thematiques">Thématiques - SIMM</gmx:Anchor>
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                           <gmd:date>
                              <gco:Date>2025-12-09</gco:Date>
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                  <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/oh_ville/887604ec-15b0-49b4-aae9-f211ce48a224">/La Rochelle</gmx:Anchor>
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                              <gco:Date>2025-12-09</gco:Date>
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                  <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/simm.reglementaire/311abf2d-6be9-472f-9f1a-ac5729745a97">Directive Cadre Stratégie pour le Milieu Marin (DCSMM)</gmx:Anchor>
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                  <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/simm.reglementaire/5ffc6dd8-bdeb-4484-bbbd-3f813cff9da0">Directive Cadre sur l'Eau (DCE)</gmx:Anchor>
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                  <gmd:MD_KeywordTypeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_KeywordTypeCode"
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                           <gmd:date>
                              <gco:Date>2025-12-09</gco:Date>
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                  <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/odatis_centre_donnees/34c66ea5-3b28-4a1f-9cd7-623c827dc525">CDS-SISMER</gmx:Anchor>
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                  <gmd:MD_KeywordTypeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_KeywordTypeCode"
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                        <gmx:Anchor xlink:href="https://vocab.ifremer.fr/scheme/SXT/odatis_centre_donnees">Centre de données ODATIS</gmx:Anchor>
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                           <gmd:date>
                              <gco:Date>2026-01-19</gco:Date>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/BENTHA/">Habitats benthiques</gmx:Anchor>
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               <gmd:keyword>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/SUSPMA/">Matières en suspension</gmx:Anchor>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/NUTS/">Nutriments</gmx:Anchor>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/PIGM/">Pigments</gmx:Anchor>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/PHYTO/">Phytoplancton</gmx:Anchor>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/CONT/">Contaminants</gmx:Anchor>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/ZOO/">Zooplancton</gmx:Anchor>
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                  <gmx:Anchor xlink:href="http://vocab.nerc.ac.uk/collection/OD1/current/DOXY/">Oxygène dissous</gmx:Anchor>
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