MACNOMS

MACNOMS data collection, processing and analysis and reporting tools are made up of customized software programs and instruments that provide system flexibility and serve multiple stakeholders seeking to stay abreast of aviation activity in the twin cities metropolitan area.

MAC Community Relations Office staff use MACNOMS data  to make informed decisions about aircraft noise and operations impacts and evaluate specific aircraft operations and share details when needed. Community members can access near real-time flight operations information and can review detailed historical information at their convenience. 

The MACNOMS system can be broken down into four main components: data collection, data processing, data analysis and publication, and community tools for accessing data. These components are described in more detail below.  

Data Collection

Aircraft Flight Tracking

MACNOMS collects flight track data through a multi-sensor surveillance data feed available for the U.S. National Airspace System. The data feed is a fusion of multiple data collection services, including data from a privately-owned network of Automatic Dependent Surveillance-Broadcast (ADS-B) sensors, FAA en route and terminal secondary surveillance data, FAA Airport Surface Detection Equipment Model X (ASDE-X) data, FAA Wide Area Multilateration (WAM) data, and FAA flight plan data.

The MAC has an agreement with an external secure data-handler to provide the merged data feed for flights operating within a 40-mile area around the Minneapolis-St. Paul International Airport (MSP) and extending to a height of 20,000 feet. This surveillance area covers all seven MAC-owned airports. The data-handler provides the MAC with a nightly file of the previous day's flight data as well as a real-time feed that is updated every second. This allows for a "near-real-time" streaming flight tracking capability on the MAC FlightTracker application (macnoms.com). The MAC is required by law to delay showing real-time flight data for 1 minute.

The technology being used to collect and process flight data provides a high level of accuracy, quick data update rates, expansive coverage and superb reliability when compared to traditional flight tracking systems.

Aircraft Noise Monitoring and Measuring

The MAC's system of 39 Remote Monitoring Towers (RMT) is one of the most extensive permanent aircraft noise monitoring systems in the world. This system monitors noise events continuously in communities surrounding MSP.

Each RMT site consists of laboratory-quality noise monitoring equipment that includes a noise analyzer, a preamplifier and a measurement microphone. This equipment undergoes annual calibration and certification by an independent accredited laboratory. 

The analyzer in each RMT monitors noise levels continuously utilizing slow response with A-weighting as directed by the Federal Aviation Regulations (14 CFR Part 150). The analyzer is set to detect an event when the sound pressure level (SPL) reaches 65 dBA and records an event when the SPL remains at or above 63 dBA for at least eight seconds. These measured noise events are downloaded daily and correlated with flight tracks to determine whether the noise source was an aircraft event or a community event. 

Each RMT has an "area of influence," which can be thought of as a cylinder surrounding it. The size of the area of influence varies based on the location of the RMT.  If an aircraft flies through the area of influence and correlates with the time of a noise event then the event is determined to be caused by the aircraft. When multiple aircraft correlate to the same noise event, the aircraft that is known to produce louder events is correlated with the event.  If there is no aircraft in the area of influence during the noise event window of time, the event is determined to be caused by a source within the community.

Data Processing

Much of MACNOMS is built using publicly available open-source software. The internal and external data access is made possible through customization of the open-source software, which increases data analysis flexibility and publication capabilities. 

Flight track spatial data and measured aircraft noise data are stored in MACNOMS. The data are processed each night to correlate aircraft operations and associated noise through the "Noise-to-Track" process, which determines which noise events are associated with each MSP arrival and departure.

Data Analysis and Publication 

Other MACNOMS data processes tag aircraft events to specific airports, establish runway use, determine compliance with noise abatement procedures, and calculate noise impacts with various metrics such as Day-Night Average Sound Level (DNL), Time Above, and Number Above. 

MACNOMS data and tools have proven to be valuable for investigating specific aircraft operations and associated noise. MAC Community Relations Office staff are able to analyze flight data and aircraft noise to identify trends, view activity for specific locations, research runway use and fleet mix information, and to conduct sophisticated modeling and analyses associated with environmental assessments, planning studies, and aircraft flight procedure monitoring and development. MAC staff also use MACNOMS data and tools to investigate aircraft activity complaints and evaluate complaint trends.

Community Tools for Accessing Data

The Interactive Reports tool provides options for the public to view arrival and departure information, runway use statistics, aircraft fleet mix, and aircraft noise data for specified dates and times that are indicated by the user. 

The MAC FlightTracker web tool allows users to investigate and research aircraft operations at all of the MAC-owned airports. The FlightTracker viewing options provide flexibility for accessing flight data through any updated internet browsers, and include static flight track maps, variable animated replay of aircraft activity, and streaming flight activity (with 10 minutes of delay). 

Members of the community who wish to view aircraft activity and noise information or submit an aircraft noise complaint may do so easily and conveniently through the customized web-based tools and reports provided on the Community Relations Office website.  Complaint information entered by the community member goes directly into the MACNOMS database for analysis. Anyone with questions about aircraft activity may use the MAC FlightTracker to evaluate flight details.

The MAC's commitment to the community is demonstrated by its investment in delivering high-quality data through user-friendly tools. MACNOMS makes it possible for the public to access detailed aircraft operations data in a timely way through convenient methods. 

For more information about MACNOMS, please contact the MAC Community Relations Office staff at 612-726-9411 or use the Contact Us web form.