{
    "id":"routes-surfaces-orsay",
    "title":"Routes d'Orsay, surfaces de chaussee (troncons BD TOPO)",
    "description":"Surfaces de chaussee (polygones) des troncons de route de la commune d'Orsay (91471, Essonne), derivees de la BD TOPO V3 de l'IGN. Chaque troncon de route (LineString) est transforme en polygone de surface par tampon (buffer) applique de part et d'autre de l'axe, sur une demi-largeur. La largeur utilisee est l'attribut largeur_de_chaussee de la BD TOPO (en metres) quand il est renseigne ; sinon une largeur par defaut selon la nature de la voie (autoroute ou nationale : 10 m, route a 2 chaussees : 8 m, departementale : 7 m, voie communale : 5 m, chemin : 3 m, sentier : 2 m). Le tampon est calcule en projection metrique Lambert-93 (EPSG:2154), avec extremites et jointures arrondies, puis reprojete en WGS84 (EPSG:4326). Les troncons sont decoupes au contour communal d'Orsay (source : API Decoupage administratif, geo.api.gouv.fr). Un polygone par troncon. Source des troncons : WFS Geoplateforme IGN, couche BDTOPO_V3:troncon_de_route. Proprietes : nature, nom, importance, largeur_m, largeur_source, nombre_de_voies, sens_de_circulation.",
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            "title":"Download as Shapefile",
            "href":"/collections/routes-surfaces-orsay/items?f=shp"
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        {
            "type":"application/zip",
            "rel":"download",
            "title":"Download as GeoPackage",
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            "rel":"root",
            "title":"The landing page of this server as JSON",
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            "href":"https://geo.core.dataizen.eu?f=html"
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            "title":"This document as JSON",
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            "type":"application/schema+json",
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        },
        {
            "type":"text/html",
            "rel":"http://www.opengis.net/def/rel/ogc/1.0/schema",
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        {
            "type":"application/schema+json",
            "rel":"http://www.opengis.net/def/rel/ogc/1.0/queryables",
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            "rel":"http://www.opengis.net/def/rel/ogc/1.0/queryables",
            "title":"Queryables for this collection as HTML",
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        "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",
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