King County GIS Center
King Street Center
201 S. Jackson St.
Suite 706
Seattle, WA 98104

+ 47.59909 N
- 122.33136 W

+ 47°  35' 56.72"
- 122° 19' 52.90"


Noise Contours (One Decibel) for King County International Airport

Description | Contacts | Attribute Information | Constraints

Data layer thumbnail image


Subject category: enviro
Title: Noise Contours (One Decibel) for King County International Airport
Feature Count: 0
Feature Type: Polygon
Abstract: Noise contours are based on noise and contour modeling. Contour modeling is a very key element of the FAA FAR Part 150 Study. It is imperative that these contours be accurate for the meaningful analysis of airport and roadway noise impacts. The noise contours can then be used to predict the changes to the noise environment as a result of any of the development alternatives under consideration. The FAA Integrated Noise Model (INM) Version 6 was used to model the flight operations contours at King County International Airport (KCIA). INM Version 6 was released for use in October 1999. One of the most important factors in generating accurate noise contours is the collection of accurate operational data. The INM programs require the input of the physical and operational characteristics of the airport. Physical characteristics include runway coordinates, airport altitude, and temperature and optionally, topographical data. Operational characteristics include various types of aircraft data. This includes not only the aircraft types and flight tracks, but also departure procedures, arrival procedures and stage lengths that are specific to the operations at the airport. Aircraft data needed to generate noise contours include: number of aircraft operations by type, types of aircraft, day/evening/night time distribution by type, flight tracks, flight track utilization by type, flight profiles, typical operational procedures, and average meteorological conditions.
Purpose: King County International Airport (KCIA) noise contours were generated with FAA Integrated Noise Model (INM) Version 6. The existing noise environment for KCIA was analyzed based upon 1999 operational conditions. The data was derived from various sources. This includes aircraft tower counts, Aircraft Situational Display data, ARTS flgiht track data, Boeing commercial aircraft operations, commercial flight schedules, field observations, and a review of the results of the noise measurement survey. A variety of operational data is necessary in order to determine the noise environment of the airport. This data includes the following summary information: Aircraft Activity Levels, Fleet Mix, Seasonal Variation in Operations, Time of Day, Runway Use, Flight Path Utilization, and Run-up Activity. These noise contours were developed for cumulative noise levels in terms of DNL (Day Night Level). The aircraft single event noise level data are combined with aircraft operational data to develop cumulative noise exposure levels over the full 24-hours. This combination of data generates the DNL noise level value
Status: Complete
Updated: As needed
Time period of content: (single date,as YYYYMMDD):: 20080101
Time period of content: (date range, as YYYYMMDD):: -
Spatial reference: WA State Plane North
FGDC Documentation: Classic or FAQ
Open Data Availability: Yes
Place Keywords: Washington state, King County, WA, Pacific NW,
Theme Keywords: noise, airport, noise contours, environmental, enviro, environment,
Lineage: Not available
Supplemental Information: None


Maintained by:
King County Dept. of Transportation, International Airport
Primary: Vanessa Ng, GIS Analyst, 206-205-0650
(How to e-mail a County contact)
Secondary: KCGIS Center; This mailbox is monitored during business hours.

Attribute Information

_DNL_Day Night LevelInteger value of decibel level


Access: None

Use: King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.