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        <gco:CharacterString>Cette couche de données intégrée au rapportage européen 2012 localise l'exposition aux bruits issus exclusivement de sites industriels selon l’indice Lden dans les grandes agglomérations wallonnes.

La donnée est présentée ici dans sa version conforme INSPIRE.

La cartographie du bruit issus exclusivement de sites industriels dans les grandes agglomérations wallonnes établie à partir de données sources de 2011 constitue la première réalisation et, en l’état, la référence à ce niveau. Les cartes de bruit ont été rapportées à l’Agence européenne pour l’environnement et sont intégrées dans le rapportage 2012.

L’indice Lden est un des deux indicateurs préconisés par la directive européenne 2002/49/CE, relative à l'évaluation et à la gestion du bruit dans l'environnement, afin de mesurer le niveau sonore décrivant le bruit dans l'environnement. Au sens de la Directive, ce dernier est émis par les moyens de transports, le trafic routier, ferroviaire ou aérien ou provient de sites d'activité industrielle. La présente couche de données fait référence à la cartographie du bruit généré par l’industrie dans les grandes agglomérations wallonnes (Liège et Charleroi) en 2011 selon l’indice Lden. 

L’indice Lden signifie "Level Day - Evening – Night". Il s’agit donc d’un indicateur du niveau de bruit global pendant 24 h (jour, soir et nuit) utilisé pour qualifier la gêne liée à l'exposition au bruit. Il est calculé à partir des indicateurs "Lday", "Levening" et  "Lnight", qui sont les niveaux sonores moyennés sur les périodes 7h-19h, 19h-23h et 23h-7h. Le Lden est exprimé en décibel A (dB(A)), qui est l’unité retenue pour représenter les sensibilités de l’oreille humaine. 

Dans le calcul de Lden, les indicateurs "Levening" et "Lnight" sont pondérés pour tenir compte du fait, qu’à niveau égal, nous sommes plus sensibles au bruit au cours de ces périodes :
- +5 dBA à la période de la soirée, ce qui signifie qu’un véhicule circulant en soirée est considéré comme équivalent presque trois véhicules circulant le jour ;
- +10 dBA à la période de nuit, ce qui signifie qu’un véhicule circulant en soirée est considéré comme équivalent presque dix véhicules circulant le jour.

Selon les critères définis pour la cartographie des bruits émanant des sites industriels dans les grandes agglomérations en 2011, la couche de données porte sur les sites classés IPPC situés sur le territoire d'agglomérations de 100.000 habitants et plus. En région wallonne, il s'agit des territoires communaux de Liège et Charleroi. Seules ces zones sont couvertes par la cartographie.

L’indicateur est moyenné sur une année civile. La couche de données est donc représentative d'une situation annuelle régionale. Les cartes de bruit de l’industrie dans les grandes agglomérations ont été élaborées sur base de données sources datant de 2011. Dès lors, les couches de données transcrivent l'exposition au bruit à cette période de temps. Les informations ont été rapportées à l’Agence européenne pour l’environnement en 2012 et sont donc intégrées dans le rapportage 2012.

La couche de données est une couche vectorielle avec, en attribut, la valeur Lden. 5 classes d’exposition sont retenues : 55-59, 60-64, 65-69, 70-74 et supérieure à 75 dB(A). L’identifiant de l’industrie génératrice du bruit est repris pour chaque ensemble d’exposition.</gco:CharacterString>
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                  <gmd:title>
                    <gmx:Anchor xlink:href="http://data.europa.eu/eli/reg/2010/1089">RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques</gmx:Anchor>
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                <gco:CharacterString>Voir la spécification référencée</gco:CharacterString>
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              <gmd:pass>
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      <gmd:report>
        <gmd:DQ_DomainConsistency>
          <gmd:result>
            <gmd:DQ_ConformanceResult>
              <gmd:specification>
                <gmd:CI_Citation>
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                    <gmx:Anchor xlink:href="https://inspire.ec.europa.eu/id/document/tg/hh">INSPIRE Data Specification on Human Health and Safety – Technical Guidelines, version 3.0</gmx:Anchor>
                  </gmd:title>
                  <gmd:date>
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                      <gmd:date>
                        <gco:Date>2013-12-10</gco:Date>
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          <gmd:statement>
            <gco:CharacterString>Les informations généalogiques propres à la constitution de cette couche de données sont référencées dans la fiche de métadonnées de la série. 

https://geoportail.wallonie.be/catalogue/491c68e2-46d1-4e44-8602-8ad05b40fc49.html</gco:CharacterString>
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</gmd:MD_Metadata>

