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            <gco:CharacterString>INSPIRE - Niveau de bruit Lnight des axes ferroviaires dans les grandes agglomérations en Wallonie (BE)</gco:CharacterString>
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        <gco:CharacterString>Cette couche de données intégrée au rapportage européen 2012 localise l'exposition aux bruits issus exclusivement des axes ferroviaires selon l’indice Lnight dans les grandes agglomérations wallonnes.

La donnée est présentée ici dans sa version conforme INSPIRE.

La cartographie du bruit des axes ferroviaires sur 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 Night 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 les axes ferroviaires traversant les grandes agglomérations wallonnes (Liège et Charleroi) en 2011 selon l’indice Lnight..

L’indice Lnight (ou Ln – Level Night) représente le niveau sonore moyen déterminé sur l'ensemble des périodes de nuit (de 23h à 7h) d'une année (ici 2011). Cet indice étant, par définition, un indice de bruit exclusif pour la période de nuit. Il est associé aux perturbations du sommeil. Contrairement aux paramètres rentrant en compte dans le calcul de l’autre indicateur (Lden), aucune pondération n'est appliquée pour son calcul. Il est exprimé en décibel A (dB(A)), qui est l’unité retenue pour représenter les sensibilités de l’oreille humaine.

Selon les critères définis pour la cartographie des bruits émanant des axes ferroviaires dans les grandes agglomérations en 2011, la couche de données porte sur tous les tronçons de voies ferrées traversant 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. Elle a été élaborée 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 Lnight. 5 classes d’exposition sont retenues : 50-54, 55-59, 60-64, 65-69, et &gt; 70 dB(A). Les valeurs basses et hautes de la classe d’exposition concernée sont rappelées en attribut.</gco:CharacterString>
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ACCÈS : 
Les conditions générales d'accès s’appliquent (http://geoportail.wallonie.be/files/documents/ConditionsSPW/DataSPW-CGA.pdf)

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