![]() This list of available reports s ummarizes sound measurements taken in national parks. Visit Measuring Sound to learn more about how the NPS measures and analyzes sounds. The audio recordings provide information about their source of origin, such as wildlife, weather, park visitors, and park operations, and how these variables interact. Technicians study these sounds using spectrograms - images that display the sounds according to brightness and color, frequency, and time of occurrence (see graphic, right). Sounds gathered are analyzed at the Listening Lab, a research collaborative between the NPS and the Sound and Light Ecology team at Colorado State University. The systems record audio as mp3 files and sound pressure levels in decibels, and are designed to replicate the hearing experience of a person on the ground. The data is collected through recording systems installed by the Natural Sounds and Night Skies Division in selected parks for about a month at a time. National Park Service scientists record and analyze sounds in national parks to inform and improve management of national parks across the country.
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