Posted on

Information Regarding “Raw” Noise Data

Document Library
Sea-Tac Airport
Noise

This document from Seattle-Tacoma International Airport explains what 'raw' noise data is, how it is collected and processed, and how the public can request it. The unfiltered, one-second decibel readings captured by the Port's noise monitors are not matched to specific aircraft and must be viewed with specialized Larson Davis software; a vendor processes the data using algorithms to produce standard aviation noise metrics. Residents can request raw data through the Washington State Public Records Act portal, though the Port disclaims any liability for how the data is used and notes it cannot be directly compared to the FAA-required DNL noise contour values used for sound insulation eligibility.

Open full document

Notes

Fact sheet from Port Of Seattle / Seattle-Tacoma International Airport (Sea-Tac Airport) explaining raw noise data provided through Public Records Act (Chapter 42.56 RCW) requests. Covers what raw data is (unfiltered 1-second dB recordings from Larson Davis noise monitors, not correlated with aircraft overflights), how the vendor processes it using algorithms and aircraft overflight correlations to calculate standard aviation noise metrics, and data limitations relative to FAA-required DNL (Day Night Level) values generated by the Aviation Environmental Design Tool (AEDT). Specifies that raw files can only be viewed with Larson Davis G4 Utility software, and that metrics such as LZpeak, LASmax, LASmin are not typically used by the Port. Includes legal disclaimer disclaiming Port liability for use of raw data.

Sidebar On/Off
V V