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Thursday, May 23 • 11:05am - 11:25am
DTA Presentation - Sound Transit's Interactive Noise Map Application (INMA)

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Sound Transit requested an Interactive Noise Map Application (INMA) to display noise information pertaining to the Link Light Rail and its expansion projects. The project consisted of creating a noise map on ArcGIS Desktop and publishing the feature layers to a server, which then conveys the noise data to a community-based website. The map used open-source parcel information from King, Snohomish, and Pierce Counties, and noise data from the 90% Final Design Documents of the Lynnwood Link Extension project. INMA currently focuses on the North Link Light Rail expansion from Northgate Mall to Lynnwood, Washington. However, INMA has the potential to accommodate all of the Sound Transit projects. The website is designed so that users can search by address or parcel ID, scroll through the map, and retrieve specific noise information by selecting a parcel. The website is accessible on all devices and autofits to the device. The goal of INMA is to create a website that effectively displays noise information for the community. The map uses three core layers: Link Light Rail Track, Link Light Rail Station, and Parcel Noise Data. The Parcel Noise Data shows existing noise levels in the area, both before and after mitigation. The user can choose which type of noise map is displayed. The map’s symbology classifies noise into five different groups: 0-56 dBA, 57-59 dBA, 60-65 dBA, 66-70 dBA, and 71-80 dBA. These groups were specified by Sound Transit, as any level under 60 decibels (dBA) is not a concern. Levels between 60 and 65 dBA could approach the maximum allowable noise level. Parcels above 65 dBA are at risk of exceeding the allowable noise levels specified by the Federal Transit Administration. Details of INMA’s creation and design can be found in the Technical Report submitted to Sound Transit.


Thursday May 23, 2019 11:05am - 11:25am
GTCC RM 315 Tacoma Convention Center, 1500 Commerce St, Tacoma, WA 98402

Attendees (7)