Dataset Direct Download Service (WFS): Areas exposed to the noise of the 650 departure road north of Niort at night (Ln) in Deux-Sèvres

The European Directive on Strategic Noise Maps requires as a minimum the representation of the overall noise indicators Lden and Ln, for each source. These indicators correspond to the incident noise on the facades. The indicators represented are expressed in dB(A) and reflect a notion of overall discomfort or health risk.
The data represents areas exposed to land transport infrastructure noise at night (Ln) using isophone curves drawn in steps of 5 dB(A) starting at 50 dB(A).
The route concerned is the Avenue Saint-Jean d’Angély in Niort.
The Ln is the average sound level that isolates the night period (22h-6h).
It can be associated with the risk of sleep disruption.
Articles L572-1 to 11 of the Environmental Code laying down various provisions for adaptation to Community law in the field of the environment and the implementing texts (Decree No 2006-361 of 24 March 2006, Decree of 4 April 2006 and Circular of 7 June 2007 on the drawing up of noise maps and plans for the prevention of environmental noise) provide for the indicators, the calculation methods to be used and the results
I'm waiting for you.

《欧盟战略噪声地图指令》（European Directive on Strategic Noise Maps）明确要求，其最低标准为针对每一类噪声源，表征总体噪声指标Lden与Ln。上述指标对应建筑外立面上的入射噪声，以dB(A)为计量单位，可反映整体噪声不适感与健康风险的相关内涵。
本数据集采用以50dB(A)为起始值、以5dB(A)为步长绘制的等响曲线（isophone curves），表征夜间时段受陆地交通基础设施噪声影响的区域，对应评价指标为Ln。
本次涉及的路段为法国尼奥尔市的圣让当热利大道（Avenue Saint-Jean d’Angély）。
指标Ln为夜间时段（22时至次日6时）的平均声级。
该指标与睡眠干扰风险存在关联。
法国《环境法典》第L572-1至L572-11条，以及为适配欧盟环境领域法律而制定的配套实施文本（包括2006年3月24日第2006-361号政令、2006年4月4日政令及2007年6月7日《关于编制噪声地图与环境噪声防治方案的通告》），明确了本数据集所采用的噪声指标、计算方法及结果要求。