Description

These maps also referred to as “type c maps” represent the parts of territories likely to contain buildings exceeding the limit values referred to in Article L571-6 of the Environmental Code and laid down by Article 7 of the Order of 4 April 2006. Layer produced by GIS workshop (June 2018) by compiling type C noise zones related to road infrastructure (CEEREMA report on strategic noise maps) du Jura — Unconceded January 2018), Ferrovières (CEEREMA report on Strategic Noise Maps — September 2017 rail network) and motorway (June 2018 data) For type C maps (CBSTYPE), each noise zone shall be bounded by the lower limit isophone curve (Lden > 68 or 73, Ln > 62 or 65). For roads, the limit values correspond to a Lden of 68 dB(A) and a Ln of 62 dB(A). For conventional railways, the limit values correspond to a Lden of 73 dB(A) and a Ln of 65 dB(A). The noise level on a noise map is represented on the basis of regulatory indicators: the “Ln” (Level night) (indicator used for this geographical layer) and the “Lden” (Level day-evening-night) which are harmonised indicators at European level. The Ln is the average sound level for the night period (22h-6h). The Lden is the 24-hour weighted average sound level to account for the perceived discomfort with the same noise level, which is greater in the evening and at night compared to the day.

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Name	Format	Description	Link
	0		http://atom.geo-ide.developpement-durable.gouv.fr/atomMetadata/GetResourceDescription?id=dc4e4a68-7d9e-4f26-bc08-f3eb7a32c8ca

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