Dataset Direct Download Service (WFS): Noise zones linked to major railway infrastructure — Type c chart C index Lden (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: rail, type of card c 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条规定整理的战略噪声地图通用表格聚合，适用场景为基础设施项目，相关基础设施类型为铁路，地图类型为c类，噪声评价指标为Lden指数。 噪声等级区域基于噪声评价指标或受噪声影响的区域表征噪声暴露状况，主要用于依据《环境法典》第R.572-5条编制战略噪声地图。 噪声暴露地图（或称a类地图）展示以5 dB(A)为间隔绘制的等声级线（isophone curves）；受噪声影响区域地图（或称‘b类地图’）由省级行政法令划定；而限值超标地图（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24小时等效声级，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。