Simple download service (Atom) of the dataset: Noise zones related to major road infrastructure — Map of type a — Lden index (equivalent noise level over 24h) — departure from Tarn-et-Garonne

Aggregation of generic tables describing strategic noise maps pursuant to Article 3-II-1°-b of the Decree of 24 March 2006, for an infrastructure, type of infrastructure concerned: road map type a and Lden index. Noise level zones describe a noise exposure situation based on a noise indicator or area affected by noise. They are used primarily for the preparation of strategic noise maps pursuant to Article R.572-5 of the Environmental Code. Noise exposure maps (or type a map) represent the isophone curves of 5 in 5 dB(A). The maps of the areas affected by noise (or “type b” maps) are defined by prefectural decrees. And limit value exceedance maps (type c map) represent for the mapping year the areas where the Lden and Ln limit values are exceeded (the Lden index (equivalent 24h sound level) and the Ln index (noise level over a night period from 22h to 6h)). Data source by infrastructure: CEREMA, ASF本数据集为依据2006年3月24日法令第3-II-1°-b条规定，针对基础设施编制的战略噪声地图（strategic noise maps）相关通用表格的聚合数据，所涉基础设施类型为a类道路地图与Lden指数。 噪声级区（noise level zones）以噪声指标或受噪声影响的区域为依据，描述噪声暴露状况，其核心用途为依据《环境法典》第R.572-5条编制战略噪声地图。 噪声暴露地图（即a类地图）展示间隔为5dB(A)的等声级曲线（isophone curves）；受噪声影响区域地图（即“b类地图”）由省级政令划定；限值超标地图（c类地图）则展示制图年度内Lden与Ln限值超出的区域——其中Lden指数为等效24小时声级，Ln指数为22时至6时夜间时段的噪声级。本数据集按基础设施分类的数据源为CEREMA与ASF。