Noise map (NIGHT type map) — Department of Pyrenees-Atlantiques

The European Directive 2002/49/EC of 25 June 2002 on the assessment and management of environmental noise aims to assess the exposure to noise in the Member States in a harmonised manner. It defines them as data representations describing a sound situation according to a noise indicator, indicating exceedances of limit values, the number of people exposed. (Article 3 of the Decree of 24 March 2006 and Article 7 of the Decree of 4 April 2006). Noise cards have no prescriptive character. These are informational documents which are not enforceable at the legal level. As graphic elements, on the other hand, they can complement a local urban planning plan (PLU). As part of an urban travel plan (UDP), maps can be used to establish reference states and target areas where better traffic management is needed. To quantify the level of noise emitted by an infrastructure during an average day, two indices are used, the Lden index and the Ln index, recommended for all modes of transport at European level: — Lden: indicator representative of the average level over all 24 hours of the day, — LN: representative indicator of the average sound level for the period 22:00-6:00. (average night equivalent noise). Noise levels are evaluated using numerical models (computer software) integrating the main parameters that influence noise and its propagation (traffic data, terrain topology, meteorological data,...). The noise maps thus produced are then cross-referenced with the demographic data of the areas concerned in order to estimate the population exposed to noise pollution. The sound level indicated on the noise maps is derived from a calculation method that gives approximate values and often higher than reality (maximalists) in a noise zone considered critical. An “in situ” noise control can precisely determine the noise to which a construction and its occupants may be exposed. Noise exposure cards (only for type A cards) night. It is a map representing (for the year of #x27; charting), the areas exposed to more than 50 decibels (A) in Ln or LNA. There are the right-of-way of the various noise zones ranging from 50 decibels to 70 decibels on the main road infrastructure of the department of the Atlantic Pyrenees. __Origin__ This layer results from the assembly of noise layers of type A corresponding to the main road sections with steps from 5 by 5 from 50db to 70db, whether for national roads (RN134), departmental roads (D1 D2 D6 D9 D9 D33 D100 D281 D309 D501 D635 D810 D811 D817 D834 D911 D912 D918 D932 D936 D938 D943 D947) and municipal roads. The reference situation is 2011. The zones of the same sound value were assembled together to obtain in the end the general influence of each value individually. We thus obtain a geographical object with a color predefined by the COVADIS standard for each range of sound values (db) which corresponds to the ' scale from 1/25000th to isophone curves in Lden by step of 5 in 5. Cf Prefectural decrees of June 2013, approving strategic noise maps of national, departmental and municipal roads on the territory of the Pyrénées-Atlantiques. __Partner organisations__ DDTM Pyrénées-Atlantiques __Links annexes__ * [XML metadata view](http://ogc.geo-ide.developpement-durable.gouv.fr/csw/all-dataset?REQUEST=GetRecordById&SERVICE=CSW&VERSION=2.0.2&RESULTTYPE=results&elementSetName=full&TYPENAMES=gmd:MD_Metadata&OUTPUTSCHEMA=http://www.isotc211.org/2005/gmd&ID=fr-120066022-jdd-05440055-4fa1-46af-944c-d6b8d790b9bb) [See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/68c413cd3dfeeaaa379a5e0d1bc773e8a03fadf2)