Traffic Noise Overlay: Difference between revisions

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{{learned|what the Traffic Noise overlay is|which information is displayed on the Traffic Noise overlay|which additional information is displayed in the hover panel|how to add or remove the Traffic Noise overlay|}}
[[File:Traffic_Noise-Overlay.jpg|thumb|left|Optional Traffic Noise overlay]]
==What is the Traffic Noise overlay?==
The Traffic Noise Overlay is an [[Grid overlay|overlay]] which displays the impact of traffic noise in DB(A) for the project area. Based on [[Traffic Flow (Overlay)|traffic flow]], distance and several computation parameters a grid is calculated for the project area. Note, this overlay only shows the impact of traffic noise on top of a background value of 48 dB(A). Influence of other sources (e.g. windmills, air traffic, factories, etc) is excluded.<br>
It becomes available for all stakeholders when added to a project.
<br clear=all>
 
==Calculations==
The calculations follow the standard rekenmethode 1 (SRM 1), as described on [http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII]:
 
LAeq = E + Co + Cr - Da - Dl - Db - Dm
 
where:
* LAeq: equivalent noise level (dB(A))
* E: emission
* Co: acceleration term (default = XXX dB(A))
* Cr: reflection term (omitted)
* Da: distance reduction
* Dl: air reduction (default = XXX dB(A))
* Db: surface reduction (default = XXX dB(A))
* Dm: meteorological reduction (default = XXX dB(A))
 
Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
 
===Emission===
Emission is computed as:
 
E = 10 * log(10^(Elv/10)+10^(Emv/10)+10^(Ezv/10)
 
Per vehicle category, the emission is computed as:
 
Em = am + bm * log(m/v0) + 10 * log(Q/vm)+Cw;m
 
and 


[[File:Traffic_Noise-Overlay.jpg|thumb|420px|left|Active Traffic Noise overlay]]
Cw;m = σm + τm x log(vm/v0,m)
The Traffic Noise overlay is an [[Overlay]] which displays the impact of traffic noise in different colors for the project area. These colors indicate traffic noise ranges from 0 dB to 75+ db. Based on [[Traffic Flow (Overlay)|traffic flow]] and distance a grid is calculated for the project area.
 
<br clear=all>
where:
===Traffic Noise ranges===
[[File:Traffic_Noise-Overlay_Legend.jpg|frame|400px|right|Traffic Noise ranges and colors]]
Traffic noise polution is indicated in the following ranges:
* 0 - 50 dB
* 50 - 55 dB
* 55 - 60 dB
* 60 - 65 dB
* 65 - 70 dB
* 70 - 75 dB
* 75+ Db
<br clear=all>


==Additional information displayed in hover panel==
* m: vehicle category (light weihgt, medium weight and heavy)
[[File:Traffic_Noise-Hover.jpg|thumb|250px|left|Hover panel displays additional information]]
* a and b: factors to be found at InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
The hover panel gives the actual noise value for the selected location when the overlay is active.
<br clear=all>


==Adding and removing==
* Cw = road surface correction
* σ = correction factor at reference traffic speed
* τ = correction factor per 10 km/hour deviation from reference traffic speed


{{Editor ribbon|header=3D World|bar=Overlays}}
===Distance reduction===
Distance reduction is computed as:


Adding and removing overlays is a generic process, however, certain overlays are dependent on other assets being present too, such as indicators, terrains, vacancy, images, etc. For more information please refer to the respective main articles for the specific overlays.
Da = 10 * log(r)


{{Editor steps|title=add the Traffic Noise overlay|Select in the editor '3D World' from the ribbon|Select 'Overlays' > 'Edit overlays' from the ribbon bar|Select the Traffic Noise overlay from the drop down menu on the bottom of the left panel|Select 'Add' from the bottom of the left panel|The overlay icon will now appear under the mini map}}
where:
* Da: distance reduction
* r: shortest distance between the source and point of evaluation


<gallery>
[[File:Geluidsoverlast.png|600px]]
File:Select3DWorld.jpg|1. Select 3D World
File:SelectEditOverlay.jpg|2. Select Overlays > Edit overlays
File:SelectDropDown.jpg|3. Select desired overlay from drop down menu on the bottom of the left panel
File:SelectAddOverlay.jpg|4. Select 'Add' from the bottom of the left panel
File:OverlayIconPresent.jpg|5. The overlay icon will  now appear under the mini map
</gallery>


{{Editor steps|title=remove an overlay|Select in the editor '3D World' from the ribbon|Select 'Overlays' > 'Edit overlays' from the ribbon bar|Select the desired overlay'*' from the list of active overlays'**' on the left panel|Select 'remove' from the bottom of the left panel|Confirm the removal in the pop up confirmation message}}
==References==
The overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government: [http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII wetten.overheid.nl]


<gallery>
==How-to's==
File:Select3DWorld.jpg|1. Select 3D World
* [[How-to add and remove an overlay|Add and remove an overlay]]
File:SelectEditOverlay.jpg|2. Select Overlays > Edit overlays
* [[How-to edit an overlay legend|Edit an overlay legend]]
File:SelectOverlay.jpg|3. Select desired overlay from the list of active overlays on the left panel
File:SelectRemoveOverlay.jpg|4. Select 'Remove' from the bottom of the left panel
File:ConfirmRemovalOverlay.jpg|5. Confirm the removal in the pop up confirmation message
</gallery>


''Sometimes it can be convenient to duplicate an already existing overlay. To do so, follow the steps for removal, but select 'Duplicate' in stead of 'Remove'.''
{{Template:Overlay nav}}

Revision as of 11:41, 3 April 2019

Optional Traffic Noise overlay

The Traffic Noise Overlay is an overlay which displays the impact of traffic noise in DB(A) for the project area. Based on traffic flow, distance and several computation parameters a grid is calculated for the project area. Note, this overlay only shows the impact of traffic noise on top of a background value of 48 dB(A). Influence of other sources (e.g. windmills, air traffic, factories, etc) is excluded.
It becomes available for all stakeholders when added to a project.

Calculations

The calculations follow the standard rekenmethode 1 (SRM 1), as described on [1]:

LAeq = E + Co + Cr - Da - Dl - Db - Dm

where:

  • LAeq: equivalent noise level (dB(A))
  • E: emission
  • Co: acceleration term (default = XXX dB(A))
  • Cr: reflection term (omitted)
  • Da: distance reduction
  • Dl: air reduction (default = XXX dB(A))
  • Db: surface reduction (default = XXX dB(A))
  • Dm: meteorological reduction (default = XXX dB(A))

Default values are taken from InfoMil [2]

Emission

Emission is computed as:

E = 10 * log(10^(Elv/10)+10^(Emv/10)+10^(Ezv/10)

Per vehicle category, the emission is computed as:

Em = am + bm * log(m/v0) + 10 * log(Q/vm)+Cw;m

and

Cw;m = σm + τm x log(vm/v0,m)

where:

  • m: vehicle category (light weihgt, medium weight and heavy)
  • a and b: factors to be found at InfoMil [3]
  • Cw = road surface correction
  • σ = correction factor at reference traffic speed
  • τ = correction factor per 10 km/hour deviation from reference traffic speed

Distance reduction

Distance reduction is computed as:

Da = 10 * log(r)

where:

  • Da: distance reduction
  • r: shortest distance between the source and point of evaluation

Geluidsoverlast.png

References

The overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government: wetten.overheid.nl

How-to's