Its full-color maps, indexed listings, and fold out map are professionally prepared with digital clarity. LAeq – Equivalent continuous sound that contains the same sound energy as a sound that varies over time. This atlas has been the people's choice for its quality and up-to-date information on the Tucson metropolitan area including South Tucson, Marana, Oro Valley, Catalina, Silver Bell, Sahuarita, Green Valley, Rita Ranch, Corona de Tucson, Sahuaro National Monument, Tohono O'Odham Nation and more. Of course, nobody went to every part of the Conterminous USA and measured the sound level with a sensor. This layer is a model built upon understanding about how noise is produced by transportation and is carried across the landscape. For this layer the sound model measures the 24-hr equivalent sound level in dBA LAeq. What does this value mean?ĭB – Decibels measure the frequency and amplitude of sound energy waves.ĭBA – Adjusted decibel measurements that also consider different sound frequencies and the varying sensitivity of the human ear. This layer combines two noise models at DOT, the aviation model and the roads model. It’s important to note that this layer does not include military bases, passenger rail, or freight rail for now. But in the future, noise layers will include some or all of these things. The current layer is still a significant step toward more rational planning decisions using the Living Atlas, as many decisions are well supported from models of ordinary road transportation and civilian aircraft noise.
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