Multi-exposure noise from rail and industrial road sources indicator Lden type A

Multi-exposure noise (combination of railway and industrial road sources) according to the Lden indicator map type A on the Aix Marseille Provence Metropolis. For performance issues, geographical contours have been simplified (Simplification Level 0.0005).本数据集对应艾克斯-马赛普罗旺斯大都会区内，基于昼间夜间等效声级（Lden）的A型噪声地图所表征的多源暴露噪声，其声源由铁路与工业道路组合而成。出于性能优化考量，数据集内的地理轮廓已完成简化处理，简化级别为0.0005。