Results at individual receivers

NoiseMap 5.2 lets you process results for individual receivers and show them on screen.

The ManualExampleDatabase supplied with NoiseMap contains some results calculated for individual receivers. Suppose you want to calculate and show the change of noise level at these receivers resulting from building the new road. You can set up a results expression to calculate this change and then show the result at every receiver in the model. You can display this on the screen as shown here:

The change of noise level at every receiver
The change of noise level at every receiver

You can select any receiver and see the result in detail:

The detailed change of level at a selected receiver
The detailed change of level at a selected receiver

View-As-Colour lets you choose which result to colour on-screen:

Selecting the change of noise level to show in colour on-screen
Selecting the change of noise level to show in colour on-screen
How do you create a results expression?

Firstly you need to calculate some receiver noise levels. Then select ‘Load Receiver Results’ and in this case load the noise calculations for ‘Existing’ and ‘New Road’ scenarios.

Creating an expression to calculate the change of noise level
Creating an expression to calculate the change of noise level

Then go to the ‘Results Expression Builder’ and select the noise index that you require, in this case LAeq, 16h, and the combination, in this case ‘All Roads’.  The change of level is then given by subtracting the ‘Do Nothing’ result  from the ‘Do Something’ result. Click OK and this calculation is immediately applied to all the receivers and can be viewed on-screen.  This result can also be exported to a file.

This is immensely powerful and can save many hours of work with a spreadsheet.

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