INSPIRE Strategic noise maps. Noise contour map for industry noise in agglomerations – Lnight

This is a polygon dataset of the strategic noise mapping of agglomeration industry for Round 4 (2022), representing the situation during 2021, in the form of noise contours for the Lnight period. The dB value represents the annual average Lnight indicator value in decibels over the night time. The values are calculated at a height of 4.0m above local terrain, not measured, and should be treated with caution when looking at specific locations. The strategic noise mapping of industry was undertaken by Noise Consultants Limited inside the three noise agglomerations, under contract to the agglomeration local authorities. The outputs of the Round 4 noise mapping exercise were generated using a new common noise assessment method for Europe (CNOSSOS-EU), as set out in the revised Annex II of Directive 2002/49/EC, and they are not directly comparable to any strategic noise maps previously generated under Rounds 1 to 3, as these revised methods calculate noise emissions, propagation and residential population exposure differently from the methods used in previous rounds. The noise maps are the product of assimilating a collection of digital datasets, and over the last 15 years there have been ongoing significant improvements to the quality of the digital datasets describing the natural and built environment in Ireland, therefore the Round 4 strategic noise mapping includes changes to the model input datasets being used, compared to previous rounds, particularly related to the industrial areas modelled, the terrain model, building heights and ground cover. The strategic noise maps should not be relied upon in the context of planning applications for noise sensitive developments in the vicinity of the mapped sources.本数据集为第四轮（2022年）产业集聚区（agglomeration industry）战略噪声制图（strategic noise mapping）的多边形数据集（polygon dataset），以夜间时段（Lnight）噪声等值线（noise contours）形式呈现，表征2021年的噪声状况。 该分贝（dB）数值代表夜间时段的年度平均夜间等效声级（Lnight）指标值，单位为分贝。 该类数值基于当地地形上方4.0米高度处计算得出，而非实地测量所得，因此在针对特定点位进行研判时需谨慎对待。 本次产业集聚区战略噪声地图由噪声顾问有限公司（Noise Consultants Limited）受三个噪声集聚区地方当局委托开展。 第四轮噪声制图工作的产出结果采用欧盟通用噪声评估方法（CNOSSOS-EU）生成，该方法遵循《欧盟指令2002/49/EC（Directive 2002/49/EC）》修订后的附件II要求。由于新版方法在噪声排放、传播以及居住人口暴露量的计算逻辑上与前1-3轮所采用的方法存在差异，因此第四轮成果无法与此前1-3轮生成的战略噪声地图直接对比。 本次噪声地图基于多套数字数据集融合生成。过去15年间，爱尔兰用于描述自然与建成环境的数字数据集质量得到了持续且显著的提升，因此相较于此前各轮次，第四轮战略噪声地图所使用的模型输入数据集已进行了更新调整，尤其在建模产业集聚区、地形模型、建筑高度以及地表覆盖等方面。 针对映射声源周边的噪声敏感型开发项目开展规划审批时，不得将本次战略噪声地图作为直接依据。