While the Australian Noise Exposure Forecast (ANEF) system helps guide land use planning decisions near airports, it is based on highly complex calculations and is not as useful to describe noise as it is heard. Aircraft noise will also be audible outside ANEF contours from time to time.
Defence has produced a series of other maps that show different aspects of noise near RAAF Base Amberley.
"Number Above" maps represent the number of times per day aircraft noise reaches a nominated decibel level.
Like the ANEF, Number Above maps are based on predictions of average flight activity and weather conditions. The specific flight paths in use and the aircraft type will result in noise being heard outside of the contours, or being different day to day.
The following Number Above maps are available for download:
Land outside ANEF contours and Number Above contours will still receive aircraft noise from time to time. Maps showing maximum noise levels can be useful to show aircraft noise that can be heard at some distance from an airport, even if only occasionally.