Snapshot - Live Noise Modelling Demonstration
Snapshot is a real-time noise modelling (and compliance) engine developed by SEG specifically for the modelling of real time noise sources. Providing the location of a noise emitter is known, from GPS tracking, and a noise profile has been previously established, Snapshot models the environmental noise levels in real time. Snapshot – tracking and compliance in real time. Snapshot is an online fully integrated real time noise monitoring and real time noise modelling solution.
Disclaimer....These noise level contours should not be relied upon for any decision regarding noise impacts from aircraft. The contours are provided as an example of Snapshot's live noise modelling capability.
Frequently Asked Questions
Snapshot is SEG’s real time noise impact (and license
compliance) modelling engine. It was developed to model noise
in real time for any noise source mining and industrial
sites. This live demonstration of aircraft noise is designed
to highlight the applications that are available for this
process.
SEG installed an ADS-B receiver in our office. The ADS-B
receiver decodes periodic radio transmissions from aircraft.
These transmissions occur every few seconds, include aircraft
identification, position, altitude and velocity.
This system is dependent on the reception of valid and
verified ADS-B data. At some times of the day no planes are
flying in the area. At other times the planes are not
transmitting all the data required for noise modelling. The
best bet is to try during daylight hours, particularly during
the early morning and evening. Sometimes the system may be
down due to technical issues but hopefully only for a short
in time. By all means send us an email if you see it's
offline.
At this stage we cover a greater southern Brisbane region.
This is region that we reliably receive the location data
from the planes.
In general the delay should not be more than a minute and the
chart is refreshed every 30 seconds. The delay can be broken
down into:
- 20s for capture of ADS-B plane data
- 10s for modelling
- Up to 30 seconds depending on when the chart was refreshed
The noise levels of various types of commercial aircraft are
regularly published by the aircrafts manufacturer Federal
Aviation Admission. We have collated this data and assigned 3
noise profiles in 1/3rd octave bands for each aircraft type
dependent on if it is climbing, cruising or descending.
The location of all aircraft close to the study area over the
last 20 seconds is obtained in terms of longitude, latitude
and elevation. All these plane locations are collected then
the maximum noise level is calculated over a 500m square mesh
using PEN3DCloud, our environmental noise model. The model
carries out an enormous number of noise calculations to
provide live contours, over 50 million daily. The noise model
includes terrain and includes screening by intervening hills
for low-flying planes. PEN3DCloud can calculate noise levels
using any reference noise prediction model.
As this is a demonstration we have updated the prevailing
weather conditions every 15 minutes from data provided by
OpenWeatherMap.org for Brisbane.
There are numerous applications for live noise modelling for
industry, mining and transport. Contact either Chris or Mark
to discuss your application.