Map Viewing Service (WMS) of the dataset: Areas exposed to the noise of the departmental road 611 from Niort to La Crèche and to Parthenay 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 routes concerned are.................................. to.....................
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
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《欧盟战略噪声地图指令》（European Directive on Strategic Noise Maps）要求至少需针对各噪声源，呈现整体噪声指标Lden与Ln。上述指标对应建筑外立面上的入射噪声。所呈现的指标以dB(A)为单位，可反映整体不适感或健康风险水平。
本数据集采用以50dB(A)为起点、每5dB(A)为间隔绘制的等声级曲线（isophone curves），呈现夜间（22时至6时）受陆路交通基础设施噪声影响的区域。
所涉线路为……至……。
Ln为夜间时段（22时至6时）的等效平均声级，可与睡眠干扰风险相关联。
《环境法典》第L572-1条至第L572-11条，以及为适配欧盟环境领域法律制定的各类配套实施文本（含2006年3月24日第2006-361号法令、2006年4月4日法令，以及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、计算方法及最终结果的相关要求。