Noise in metropolitan areas - Railways - Level grid LDEN - Mapping 2017

The data include the calculation results of the environmental noise mapping 2017 in the agglomerations in Bavaria. These are all cities in Bavaria with more than 100,000 inhabitants, i.e. Munich, Nuremberg, Augsburg, Fürth, Erlangen, Würzburg, Regensburg and Ingolstadt. In each agglomeration, noise was recorded by road traffic, industrial and commercial installations in accordance with Directive 2010/75/EU of 24 November 2010 on integrated pollution prevention and control (Industrial Emissions Directive - IED Directive) and, where available, by tram and above-ground metro transport. The noise indices LDEN and LNight in dB(A) are used as a measure of general annoyance or as a measure of sleep disturbances. The LDEN level is an emission level averaged over 24 hours, which is determined from the LDay, LEvening and LNight levels for the assessment times day (6:00-18:00), evening (18:00-22:00) and night (22:00-6:00). Weight factors of 5 dB(A) for the four-hour evening time and 10 dB(A) for the eight-hour night time take into account the increased sensitivity to noise during these times. The layer represents the noise pollution on tramways and underground lines running above ground in the agglomeration expressed by the noise index LDEN according to the EC Environmental Noise Directive.本数据集包含巴伐利亚州2017年城市群环境噪声制图计算成果，覆盖该州所有常住人口超10万的城市，具体包括慕尼黑、纽伦堡、奥格斯堡、菲尔特、埃尔朗根、维尔茨堡、雷根斯堡及因戈尔施塔特。 各城市群的噪声监测数据依据2010年11月24日发布的《关于综合污染预防与控制的2010/75/EU号指令》（工业排放指令，IED指令），由道路交通、工商业设施采集；若有可用数据，还包含有轨电车及地面地铁线路的噪声监测结果。本数据集采用dB(A)计量的昼夜等效声级（LDEN）与夜间等效声级（LNight），分别作为通用噪声烦扰度与睡眠干扰程度的评价指标。其中LDEN为24小时平均排放级，由日间（6:00-18:00）、傍晚（18:00-22:00）、夜间（22:00-6:00）三个评估时段的日间等效声级（LDay）、傍晚等效声级（LEvening）与夜间等效声级（LNight）计算得到。为体现不同时段人体对噪声的敏感度差异，设置4小时傍晚时段加权系数为5 dB(A)，8小时夜间时段加权系数为10 dB(A)。 本图层展示了各城市群内有轨电车及地面地铁线路沿线的噪声污染状况，以欧盟环境噪声指令（EC Environmental Noise Directive）规定的LDEN噪声指数作为表征。