Strategic Type C Noise Map — Day — Northern Department

The noise levels emitted by a given infrastructure over an average day are assessed using numerical models producing isophone curves translated into noise zones, according to the recommended index for all modes of transport at European level, i.e. the Lden index and the Ln index. Strategic noise maps aggregate or translate these noise zones according to the type of strategic noise map, i.e. noise exposure maps, noise-affected sectors, limit value exceedance maps, and known or foreseeable noise level change maps针对特定基础设施在典型单日的噪声排放水平，本数据集采用数值模型生成等声级曲线（isophone curves）并划分为噪声区划，评估依据为欧盟层面针对所有交通方式推荐的噪声指数，即Lden指数（Lden index）与Ln指数（Ln index）。 战略噪声地图（Strategic noise maps）则根据自身类型，对上述噪声区划进行聚合或转换，具体类型包括噪声暴露地图、受噪声影响区域地图、噪声限值超标地图，以及已知或可预见的噪声级变化地图。