Isophone metropolitan area - LDEN (ULR)

The isophone tapes show the area-by-area reproduction of the sound propagation for the noise index LDEN (day-evening-night noise index) of round 4 of the environmental noise mapping within agglomerations with the other lines and shunting and transhipment stations.本等声级线（isophone）磁带展示了城镇集聚区第四轮环境噪声制图中，针对噪声指数昼间-傍晚-夜间噪声指数（day-evening-night noise index，LDEN）的逐区域声传播重现结果，该轮制图同时涵盖了其他线路、调车站与转运站的相关噪声传播数据。