Dataset Direct Download Service (WFS): Areas exposed to highway noise 83 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 A83 motorway bypasses Niort from the north to reach Highway 10.
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》要求，针对各噪声源，至少需表征总体噪声指标Lden与Ln。上述指标对应建筑外立面所接收的入射噪声，以dB(A)为计量单位，可反映整体噪声不适程度或健康风险水平。
本数据集采用以50 dB(A)为起始值、步长为5 dB(A)的等声级线，表征了夜间受陆路交通基础设施噪声影响的区域。
A83高速公路从北侧绕行尼奥尔，以连接10号公路。
Ln为夜间时段（22时至6时）的平均声级。
该指标与睡眠干扰风险存在关联。
《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实施性法规（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规划的通告），明确规定了上述噪声指标、所用计算方法及最终结果的相关要求。