Map visualisation service (WMS) of the dataset: Strategic noise maps type C over 24 hours from Charente

Polygons of areas exceeding the 24H weighted average noise exposure limit values of Charente land transport infrastructure expressed in Lden. Weighting of the Lden indicator of the average sound level: 12 hours of day (6am — 5pm); 4 hours of evening (5 p.m. — 10 p.m.) with an increase of 5 dB; 8 hours of night (22h — 6h) with an increase of 10 dB. These increases are representative of the discomfort experienced during these periods. This zoning (CEEMA data aggregated by DDT Charente) is derived from a calculation method that gives approximate values and often higher than reality. In situ noise control can precisely determine the sound level to which a construction and its occupants may be exposed.以昼夜等效声级（Lden）表征的、超出夏朗德省陆路交通基础设施24小时加权平均噪声暴露限值的区域多边形。 该昼夜等效声级指标的加权规则为：日间（6时至17时）共计12小时；晚间（17时至22时）共计4小时，噪声加权提升5分贝；夜间（22时至次日6时）共计8小时，噪声加权提升10分贝。上述加权增量对应各时段人们所感知的噪声不适程度。 本次噪声分区数据由夏朗德省DDT整合CEEMA数据所得，其计算方法仅能给出近似值，且通常高于实际噪声水平。实地噪声检测可精准确定建筑及其住户可能暴露的声级水平。