System Requirements


  • You much have Google Earth installed on your computer to view these files. Google Earth is a free download from the internet.
  • Please note these are VERY LARGE files (there are 4 modelled cases; 3A Existing Facilities, 3B Existing Facilities plus main Road Contributions, 3C Existing Facilities plus main line Rail Contributions, and 3D Existing Facilities plus main Road and Rail Contributions).
  • It will take several minutes for the download to complete (typically 4 to 5 minutes), much longer if you are using a dial-up connection.
  • Once the download is completed and you run it (which could take an additional minute), the 4 cases appear on the left of the screen. Simply click one of them to view. If you click anywhere on the modelled outputs, the predicted noise level is displayed in decibels, dBA. Predicted noise levels outside of the colour contours are not reliable.
  • At that point you have the full functionality of Google Earth.

Calm Wind Model Outputs

  • These outputs use calm wind conditions to create the noise model outputs. Therefore they are not suitable for regulatory applications, however do represent the expected noise contributions from the sources below.
  • These outputs provide the cumulative predicted sound levels from existing NCIA member industries (with road and rail if you add those layers) up to about 5 km away from each industry. Much beyond 5 km the model outputs are not as accurate.

Industry (Facility) Models

  • Made up of the most recent noise measurements and models for each industry represented.  It is important to note that as the model assumes all equipment is running at 100% capacity 100% of the time, the model typically over predicts the measured noise level.  The regional model is updated when significant changes happen on a site that would impact the site noise model and therefore the regional noise model.

Road Contribution

  • Based on 2013 roadway traffic flow data (vehicles per hour, percentage cars/light trucks/, heavy trucks, posted speed) obtained from Alberta Transportation / Alberta Infrastructure.  This is reviewed periodically and updated when new information is available that would significantly change the modelled results.

Rail Contribution

  • Based on estimated rail traffic volume on the main lines over a 24 hour period in 2010.
  • These were then converted into 24-hour equivalent continuous sound levels.
  • NCIA is exploring ways to get better data included in the model for main line rail noise (through the rail companies).