Data batch direct download service (WFS): Strategic noise map 2017 in the Loiret: third deadline — Departmental routes

The production of strategic noise maps is framed by the following texts, which specify, inter alia, the methods of calculation, the indicators to be used and the expected results: — Articles L.572-1 to L.572-11 of the Environmental Code relating to the drawing up of noise maps and plans for the prevention of environmental noise and amending the urban planning code; — Articles R.572-1 to R.572-11 on the drawing up of noise maps and environmental noise prevention plans and amending the urban planning code; — its implementing decrees of 3 and 4 April 2006 on the drawing up of noise maps and plans for the prevention of environmental noise. Strategic noise maps are intended to represent a level of noise discomfort at a reference moment. They are developed by acoustic modelling software that takes into account the source of noise generated by car traffic, as well as many elements of the context such as topography, authorised speed or surrounding buildings. They are achieved by means of two harmonised indicators: Lden (Level Day Evening Night) and Ln (Level Night). Lden represents the average noise over the whole day of 24 hours and Ln the average noise over the night period 10 p.m. — 6 o'clock. The graphic documents produced thus allow to represent: — areas exposed to noise using isophone curves. Two types of cards are generated: one shows isophone curves in steps of 5 dB(A) (type A maps), the others show areas where limit values are exceeded (type C maps). Infrastructures concerned in the Loiret: — Departmental roads: D8, D14, D93, D94, D97, D520, D920, D921, D928, D948, D952, D960, D2007, D2020, D2060, D2107, D2152, D2271, D2701战略噪声地图（Strategic noise maps）的编制依据以下文本，其中明确规定了计算方法、需采用的指标以及预期成果等内容： — 《环境法典》第L.572-1条至L.572-11条，涉及环境噪声预防用噪声地图与规划的编制，并对城市规划法典作出修订； — 第R.572-1条至R.572-11条，涉及环境噪声预防用噪声地图与规划的编制，并对城市规划法典作出修订； — 2006年4月3日及4日发布的实施细则，关于环境噪声预防用噪声地图与规划的编制。 战略噪声地图旨在表征参考时刻的噪声不适程度，由声学建模软件开发完成，该模型需考量机动车交通产生的噪声源，以及地形、法定限速、周边建筑等诸多环境要素。 其通过两项统一协调的指标实现：Lden（Level Day Evening Night，昼间夜间等效声级）与Ln（Level Night，夜间声级）。其中Lden代表24小时全天的平均噪声水平，Ln代表22时至次日6时的夜间时段平均噪声水平。 由此生成的图形文档可用于： — 通过等响曲线（isophone curves）表征受噪声影响的区域。 共生成两类地图：一类以5 dB(A)为步长绘制等响曲线（A型地图），另一类用于展示超过限值标准的区域（C型地图）。 卢瓦雷省（Loiret）涉及的基础设施包括： — 省级道路：D8、D14、D93、D94、D97、D520、D920、D921、D928、D948、D952、D960、D2007、D2020、D2060、D2107、D2152、D2271、D2701