Aggregation generic tables noise zones type A Lden index in Héault

Aggregation of generic tables describing the Noise Zones for all terrestrial infrastructure, map type A and Lden index. ‘Type a’ exposure cards: maps to be made within the framework of the CBS pursuant to Article 3-II-1°-a of the Decree of 24 March 2006. This is a dataset representing for the year of mapping: — areas exposed to more than 55 dB(A) in Lden They represent the isophone curves of 5 in 5 dB(A). Lden: sound level indicator means Level Day-Evening-Night. It corresponds to an equivalent 24-hour sound level in which evening and night noise levels are increased by 5 and 10 dB(A), respectively, to reflect greater discomfort during these periods. Aggregation obtained by the QGIS MIZOGEO plugin made available by CEREMA. Data source by infrastructure: CEREMA.