Map Viewing Service (WMS) of the dataset: Areas exposed to road 743 noise from Niort to Parthenay 24 hours (Lden) 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 in this data set are related to the Lden indicator.
“Lden" is an indicator of the overall noise level during a day (day, evening and night) used to qualify the discomfort associated with exposure to noise. It is calculated from the indicators "Lday", "Levening", "Lnight", "average noise levels over the periods 6h-18h, 18h-22h and 22h-6h.
These are more precisely the isophone curves drawn in steps of 5 dB(A) from 55 dB(A) over a whole day.
The data here concerns RD 743 from Niort to Parthenay.
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. The data for this lot have been collected in accordance with these texts.

《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，呈现总体噪声指标Lden与Ln。此类指标对应建筑外立面上的入射噪声，以dB(A)为单位，可反映整体噪声暴露带来的不适或健康风险。
本数据集的数据均与Lden指标相关。
Lden是用于表征一日（日间、傍晚与夜间）内总体噪声水平的指标，用以衡量噪声暴露引发的不适程度。该指标由Lday、Levening与Lnight三个指标计算得出，三者分别对应6时-18时、18时-22时及22时-6时三个时段的平均噪声水平。
此处所呈现的具体为以5 dB(A)为间隔、从55 dB(A)起始绘制的全日等声级线（isophone curves）。
本数据集的数据涉及尼奥尔（Niort）至帕特奈（Parthenay）的RD 743号道路。
《环境法典》中L572-1至L572-11条款，以及为适配欧盟环境领域法律制定的各类实施文本（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），对本数据集所涉噪声指标、适用计算方法及结果输出均作出了明确规定。
特此说明：本批次数据均严格按照上述文本要求采集完成。