Simple download service (Atom) of the dataset: Strategic noise map type A according to the Lden indicator (evening day-night). Prefectural Order No 71-2018-07-13-005 of 13 July 2018.

The European Directive 2002/49/EC on the assessment and management of environmental noise aims at a harmonised assessment of exposure to noise in the Member States. It defines them as representations of data describing a noise situation according to a noise indicator, indicating exceedances of limit values, the number of persons exposed. Noise maps are not prescriptive. These are information documents that are not legally enforceable. As graphic elements, however, they can supplement a Local Planning Plan (LDP). As part of an Urban Travel Plan (UDP), maps can be used to establish baselines and target areas where better traffic management is needed. To quantify the level of noise emitted by an infrastructure over an average day, two indices are used, the Lden index and the Ln index, recommended for all modes of transport at European level: Lden: representative indicator of the average level over all 24 hours of the day, LN: representative indicator of the average sound level for the period 22h-6h. Noise levels are assessed using digital models (computer software) incorporating the main parameters that influence noise and its propagation (traffic data, field topology, meteorological data, etc.). The noise maps thus produced are then cross-checked with the demographic data of the areas concerned in order to make an estimate of the population exposed to noise pollution. The noise level shown on the noise maps is derived from a calculation method which gives approximate values and often higher than reality (maximists) in a noise area considered critical. An in situ noise control can determine precisely the noise to which a construction and its occupants may be exposed. The map of the Lden exhibition areas (type A map) represents the areas exposed to more than 55 dB in Lden according to the prefectural sound classification orders issued pursuant to the Ministerial Order of 30 May 1996 and based on a forecast evolution of traffic.《欧盟2002/49/EC号环境噪声评估与管理指令》旨在协调欧盟成员国的噪声暴露评估工作。该指令将**噪声地图（noise maps）**定义为以噪声指标为依据，描述噪声现状、标明限值超标情况及受暴露人群数量的数据表征形式。 噪声地图不具备强制性。此类文件仅为信息参考材料，不具备法律强制执行力；但作为可视化图形载体，噪声地图可作为地方规划方案（Local Planning Plan, LDP）的补充材料。 作为城市交通规划（Urban Travel Plan, UDP）的组成部分，噪声地图可用于划定基线范围与需优化交通管理的重点区域。 为量化某一基础设施单日平均噪声排放水平，欧盟层面针对所有交通方式推荐使用两类噪声指标：Lden指数与Ln指数： Lden指数：代表全天24小时的平均噪声水平； Ln指数：代表22时至次日6时时段的平均声级水平。 噪声水平评估依托融合了噪声及其传播核心影响参数的数字模型（计算机软件）开展，此类参数包括交通数据、场地地形、气象数据等。 生成的噪声地图随后将与对应区域的人口统计数据交叉核验，以估算受噪声污染影响的人群规模。 噪声地图中标注的噪声水平源自特定计算方法，该方法所得数值为近似值，在被认定为噪声敏感的区域中，计算结果往往高于实际值（即“乐观高估”）。 现场噪声检测可精准测定建筑及其使用人群可能暴露的噪声水平。 **Lden暴露区域地图（A型地图）**依据1996年5月30日部长令发布的省级噪声分类规范，并结合交通流量预测演化情况，标注出Lden指数超过55分贝的噪声暴露区域。