Dataset Direct Download Service (WFS): Sound rating of the rail network revised in 2020 in Loire-Atlantique

Sound classification of the entire rail network (SNCF 2019 — TRAM by DDTM 2020) in Loire-Atlantique revised in 2020 in the Loire-Atlantique territory. Noise classification of land transport infrastructure in the department of Loire-Atlantique: In each department, the prefect is responsible for identifying and classifying land transport infrastructure according to its acoustic characteristics and traffic (Articles L 571-10 and R571-32 to R571-43 of the Environmental Code). Land transport infrastructure is categorised into 5 categories, with category 1 being the noisyest. Each category is associated with a noise-affected sector width and a noise level to be taken into account by the manufacturers for the facade isolations to be implemented. The Order of 5 November 2020 revising the sound classification cancels and replaces the list of orders classifying land transport infrastructure in the department adopted between 19 May 1999 and 15 October 2018. Origin: The sound classification of transport infrastructure in the department of Loire-Atlantique was developed by a design office specialising in acoustics in accordance with the technical standards in force on the basis of the data provided by the infrastructure managers (SNCF Réseau, ASF, COFIROUTE, DIRO, Department, EPCI, Communes). The calculation is based in particular on traffic, the share of heavy goods vehicles, the pavement surface, speed. The ranking is based on traffic estimates at 20 years. Note the following limits on the accuracy of these layers: There is not always perfect overlay between sound classification and IGN (BD Ortho and BD Topo) repositories: there may be a discrepancy between the sound classification track and the areas affected by the noise, with the image plane backgrounds (SCAN25 or BDOrtho of the IGN as appropriate). Online mapping is provided for information purposes and only the tables annexed to the Prefectural Decree are authentic. Buffers are calculated from the centreline of the tracks, whereas in reality the limits of sectors affected by the noise must be calculated from the edge of the rail (source of noise), so one can have a few meters error for conventional tracks. Partner organisation: DDTM of Loire-Atlantique卢瓦尔-大西洋省全域铁路网声分类数据集（SNCF 2019 — DDTM 2020 有轨电车版本），2020年于卢瓦尔-大西洋省境内完成修订。 卢瓦尔-大西洋省陆地交通基础设施噪声分类： 法国各省份均由省长依据基础设施的声学特性与交通流量，开展陆地交通基础设施的识别与分类工作（符合《环境法典》第L 571-10条及第R571-32至R571-43条规定）。 陆地交通基础设施共划分为5个类别，其中第1类为噪声强度最高的类别。每个类别对应特定的噪声影响区域宽度与噪声限值，供制造商在实施外立面隔声工程时参考采用。 2020年11月5日发布的《声分类修订政令》废止并替代了1999年5月19日至2018年10月15日期间通过的该省陆地交通基础设施分类相关政令清单。 数据集来源： 卢瓦尔-大西洋省交通基础设施声分类数据集由一家专注声学领域的设计事务所编制，编制过程以基础设施管理方（SNCF Réseau、ASF、COFIROUTE、DIRO、省议会、EPCI、各公社）提供的数据及现行有效技术标准为依据。 本次测算尤其考量了交通流量、重型货车占比、路面铺装类型及行车速度，分类排名基于20年周期的交通流量预测数据。 请注意本数据集图层存在以下精度局限： 声分类结果与法国国家地理研究院（IGN）的BD Ortho（数字正射影像数据库）及BD Topo（基础地形数据库）数据集未必完全重合；声分类轨道与噪声影响区域之间可能存在偏差，该偏差源于影像平面背景数据（如适用的IGN SCAN25（25厘米分辨率航空影像数据集）或BD Ortho数据）。在线地图仅供参考，唯有省长令附件中的表格方为官方有效版本。缓冲区以轨道中心线为基准计算，但实际噪声影响区域的边界需以轨道边缘（噪声源位置）为基准测算，因此常规轨道可能存在数米的误差。 合作机构：卢瓦尔-大西洋省DDTM