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Elle reprend les incertitudes (ici coefficient de variation - CV) de mod&#233;lisation pour les teneurs en COT pr&#233;dites dans les sols sous cultures et prairies du territoire wallon pour la p&#233;riode 1949-1972. Il s'agit donc d'une mod&#233;lisation de l'erreur de pr&#233;diction.

Dans le cadre du projet CARBIOSOL (UCL - ULg - DGARNE), une couche de donn&#233;es raster de 90 m&#232;tres de r&#233;solution des teneurs en carbone organique total des sols sous cultures et prairies a &#233;t&#233; g&#233;n&#233;r&#233;e par mod&#233;lisation spatiale. Ce mod&#232;le a &#233;t&#233; d&#233;velopp&#233; pour chaque type d'occupation du sol d'int&#233;r&#234;t (cultures et prairies permanentes). 

Pour chaque occupation du sol, un Mod&#232;le Additif G&#233;n&#233;ralis&#233; (GAM pour Generalised Additive Model) a &#233;t&#233; ajust&#233; sur un jeu de calibration contenant deux tiers des points d'observation concern&#233;s. Il a ensuite &#233;t&#233; valid&#233; sur le tiers restant.

Pour plus de d&#233;tails sur la mod&#233;lisation mise en place dans la cadre de CARBIOSOL, veuillez-vous r&#233;f&#233;rer &#224; la fiche de m&#233;tadonn&#233;es documentant la s&#233;rie de couches de donn&#233;es.

La cartographie des incertitudes de mod&#233;lisation associ&#233;es aux teneurs en COT pr&#233;dites pour la p&#233;riode 1949-1974 est une couche raster spatialement continue sur les sols sous cultures et prairies et d'une r&#233;solution de 90 m&#232;tres. L'incertitude en chaque pixel est exprim&#233;e en pourcentage relatif.

La mod&#233;lisation de l'erreur de pr&#233;diction est une erreur potentielle qui permet une meilleure interpr&#233;tation des produits cartographiques finaux g&#233;n&#233;r&#233;s par le projet CARBIOSOL. La cartographie des teneurs en Carbone organique total pour la p&#233;riode 1949-1972 doit donc &#234;tre lue en association avec la carte des incertitudes. Une incertitude importante refl&#232;te une pr&#233;diction moins fiable et donc une plus grande pr&#233;caution dans l'interpr&#233;tation des valeurs.</gco:CharacterString>
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                <gco:CharacterString>Adresse de connexion au service de visualisation WMS de la couche de donn&#233;es CARBIOSOL - Incertitudes des Teneurs en Carbone organique total - p&#233;riode 1949-1972</gco:CharacterString>
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                <gmd:URL>https://geoservices.wallonie.be/INSPIRE/WMS/SO/MapServer/WMSServer?request=GetCapabilities&amp;service=WMS</gmd:URL>
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              <gmd:protocol>
                <gco:CharacterString>OGC:WMS</gco:CharacterString>
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                <gco:CharacterString>INSPIRE - Sols en Wallonie (BE) - Service de t&#233;l&#233;chargement</gco:CharacterString>
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        </gmd:MD_DigitalTransferOptions>
      </gmd:transferOptions>
    </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:dataQualityInfo>
    <gmd:DQ_DataQuality>
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        <gmd:DQ_Scope>
          <gmd:level>
            <gmd:MD_ScopeCode codeList="http://standards.iso.org/iso/19115/resources/Codelists/cat/codelists.xml#MD_ScopeCode" codeListValue="dataset"/>
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          <gmd:evaluationProcedure/>
          <gmd:dateTime/>
          <gmd:result>
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              <gmd:specification xlink:href="http://inspire.ec.europa.eu/id/citation/ir/reg-1089-2010">
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                    <gmx:Anchor xlink:href="http://data.europa.eu/eli/reg/2010/1089">R&#200;GLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalit&#233;s d'application de la directive 2007/2/CE du Parlement europ&#233;en et du Conseil en ce qui concerne l'interop&#233;rabilit&#233; des s&#233;ries et des services de donn&#233;es g&#233;ographiques</gmx:Anchor>
                  </gmd:title>
                  <gmd:date>
                    <gmd:CI_Date>
                      <gmd:date>
                        <gco:Date>2010-12-08</gco:Date>
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            <gco:CharacterString>1. Cadre de conception de la couche de donn&#233;es

La pr&#233;sente couche de donn&#233;es a &#233;t&#233; con&#231;ue dans le cadre de la subvention CARBIOSOL III (carbone organique, biomasse et activit&#233; microbienne des sols - SPW-DGO3). Elle repose sur une m&#233;thodologie de cartographie du Carbone Organique Total (COT) mise au point &#224; l'&#233;chelle de la Wallonie dans le cadre du projet CARBIOSOL I et adapt&#233;e dans le cadre de CARBIOSOL II. Cette m&#233;thode a &#233;t&#233; d&#233;velopp&#233;e par l'UCL.

2. G&#233;n&#233;ration de la couche

La pr&#233;sente couche de donn&#233;es correspond aux erreurs de pr&#233;diction induites par la m&#233;thodologie de spatialisation des teneurs en COT. 

Le calcul du coefficient de variation (CV) a &#233;t&#233; r&#233;alis&#233; via le logiciel R (package mgcv).</gco:CharacterString>
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