USA Transportation Noise SCTDD

Modeled combined railroad, road, and aviation noise (2020 version) from US Department of Transportation BTS for the conterminous USA, Alaska, and Hawaii. Extracted for the SCTDD region. The noise value expressed is the 24-hr equivalent sound level (dBA LAeq). This layer combines noise combined from three transportation modes: railroad, road, and aviation. Note: In this layer, values of the USDOT model below 45 dBA have been changed from NoData to a value of 45.0 by Esri to facilitate statistical comparison.本数据集源自美国运输部运输统计局（US Department of Transportation Bureau of Transportation Statistics, BTS）2020版铁路、公路与航空复合噪声模型，覆盖美国本土、阿拉斯加州与夏威夷州，并针对SCTDD区域完成提取。本数据集采用24小时等效声级（24-hr equivalent sound level, dBA LAeq）作为噪声值的表征指标，整合了三类交通方式的噪声数据。注：为便于开展统计对比，Esri已将本图层中美国运输部（USDOT）模型输出的低于45 dBA的无数据（NoData）值统一调整为45.0。