How were the noise maps produced?
The noise maps presented here were produced by computer modelling techniques that calculate the noise level at specific points as the sound emanates from the particular sources. The modelling software utilised data such as traffic flow, type of road and rail, types of vehicles and the nature of industrial processes. Also considered were features that can directly affect sound transmission, such as potential barriers, topography, weather conditions and how reflective or absorbent different surfaces can be. The calculations produced noise levels at receptor points on a 10 metre grid at a height of four metres above the ground.
