{ "id":"pollution-sonore-orsay-5m", "title":"Pollution sonore Lden \u00e0 5 m (Orsay)", "description":"Niveaux de bruit routier Lden sur la commune d'Orsay (INSEE 91471), a une hauteur modelisee de 5 m.\n\nSOURCE REELLE : cartographie air-bruit 2024 d'Airparif et Bruitparif (millesime 2024, donnees d'entree des cartes strategiques de bruit de 4eme echeance, resolution 5 m). Le volet bruit provient de la carte strategique du bruit des transports produite par Bruitparif (indicateur Lden, bruit routier). Chaque maille de la source est conservee individuellement (2766 entites couvrant Orsay), decoupee sur le contour communal : la carte restitue ainsi la variation spatiale reelle (bruit fort le long de la RN118 et des grands axes).\n\nCLASSES (seuils Lden bruit routier, dB(A)) :\n- Preserve : Lden inferieur a 53 (respect des recommandations OMS), couleur #1a9850\n- Altere : Lden de 53 a 68 (entre recommandations OMS et valeurs limites), couleur #fdae61\n- Tres degrade : Lden superieur ou egal a 68 (au-dessus d'au moins une valeur limite reglementaire), couleur #d73027\n\nMODELE DE HAUTEUR (assume et documente) : la source est une donnee 2D au niveau du sol. Les 3 hauteurs sont modelisees par une correction simple appliquee a la valeur representative de chaque classe : Lden(1 m) = base, Lden(2 m) = base moins 0,5 dB, Lden(5 m) = base moins 1,5 dB. Valeurs representatives de base a 1 m : 50, 61 et 71 dB(A). Cette correction traduit la legere decroissance du niveau lorsqu'on s'eloigne du sol pres des voies. Elle reste faible et ne change pas la classe : la couleur reflete la classe reelle de la source, la propriete valeur porte la modelisation par hauteur.\n\nChaque entite porte : valeur (dB(A) Lden a cette hauteur), unite, hauteur_m, niveau (1 a 3), classe, couleur (hex), source. Projection EPSG:4326.\n\nATTENTION : les valeurs par hauteur sont une modelisation, pas une mesure.", "keywords":[ "Bruitparif", "Lden", "Orsay", "bruit", "bruit routier", "nuisances sonores", "pollution sonore" ], "links":[ { "type":"text/html", "rel":"canonical", "title":"Pollution sonore Lden \u00e0 5 m (Orsay)", "href":"/dataset/pollution-sonore-orsay-5m" }, { "type":"application/xml", "rel":"service", "title":"WFS Service", "href":"/maps/paris-saclay?SERVICE=WFS&REQUEST=GetCapabilities" }, { "type":"application/xml", "rel":"service", "title":"WMS Service (MapServer)", "href":"/wms?SERVICE=WMS&REQUEST=GetCapabilities" }, { "type":"application/xml", "rel":"service", "title":"WMTS Service", "href":"/maps/paris-saclay?SERVICE=WMTS&REQUEST=GetCapabilities" }, { "type":"application/zip", "rel":"download", "title":"Download as Shapefile", "href":"/collections/pollution-sonore-orsay-5m/items?f=shp" }, { "type":"application/zip", "rel":"download", "title":"Download as GeoPackage", "href":"/collections/pollution-sonore-orsay-5m/items?f=gpkg" }, { "type":"application/json", "rel":"root", "title":"The landing page of this server as JSON", "href":"https://geo.core.dataizen.eu?f=json" }, { "type":"text/html", "rel":"root", "title":"The landing page of this server as HTML", "href":"https://geo.core.dataizen.eu?f=html" }, { "type":"application/json", "rel":"self", "title":"This document as JSON", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m?f=json" }, { "type":"application/ld+json", "rel":"alternate", "title":"This document as RDF (JSON-LD)", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m?f=jsonld" }, { "type":"text/html", "rel":"alternate", "title":"This document as HTML", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m?f=html" }, { "type":"application/schema+json", "rel":"http://www.opengis.net/def/rel/ogc/1.0/schema", "title":"Schema of collection in JSON", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/schema?f=json" }, { "type":"text/html", "rel":"http://www.opengis.net/def/rel/ogc/1.0/schema", "title":"Schema of collection in HTML", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/schema?f=html" }, { "type":"application/schema+json", "rel":"http://www.opengis.net/def/rel/ogc/1.0/queryables", "title":"Queryables for this collection as JSON", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/queryables?f=json" }, { "type":"text/html", "rel":"http://www.opengis.net/def/rel/ogc/1.0/queryables", "title":"Queryables for this collection as HTML", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/queryables?f=html" }, { "type":"application/geo+json", "rel":"items", "title":"Items as GeoJSON", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/items?f=json" }, { "type":"application/ld+json", "rel":"items", "title":"Items as RDF (GeoJSON-LD)", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/items?f=jsonld" }, { "type":"text/html", "rel":"items", "title":"Items as HTML", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/items?f=html" }, { "type":"image/png", "rel":"http://www.opengis.net/def/rel/ogc/1.0/map", "title":"Map as png", "href":"https://geo.core.dataizen.eu/collections/pollution-sonore-orsay-5m/map?f=png" } ], "extent":{ "spatial":{ "bbox":[ [ -5.0, 41.0, 10.0, 51.0 ] ] }, "temporal":{ "interval":[ [ null, null ] ] } }, "itemType":"feature", "crs":[ "http://www.opengis.net/def/crs/OGC/1.3/CRS84", "http://www.opengis.net/def/crs/EPSG/0/4326", "http://www.opengis.net/def/crs/EPSG/0/3857", "urn:ogc:def:crs:OGC::CRS84", "urn:ogc:def:crs:EPSG::4326", "urn:ogc:def:crs:EPSG::3857" ], "storageCrs":"http://www.opengis.net/def/crs/OGC/1.3/CRS84" }