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|right|Traffic Noise overlay]]
==What is the Traffic Noise overlay?==


[[File:Traffic_Noise-Overlay.jpg|thumb|420px|left|Active Traffic Noise overlay]]
The Traffic Noise Overlay is a [[Grid Overlay]] which computes the amount of noise in dB(A) for any given location in the [[project]]. The calculation takes into account traffic intensities and a number of environmental- and computation parameters to compute the noise impact. It also takes into account [[Building]]s and [[Elevation model|terrain features]] which would block the transmission of noise.


The Traffic Noise overlay is an [[Overlay]] which displays the impact of traffic noise in different colors 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.
The Overlay only computes noise from traffic. Although a background noise level can be configured, other sources of noise (such as windmills, air traffic, or factories) are explicitly excluded.
<br clear=all>
[[File:Traffic_Noise-Overlay-model.png|thumb|left|Traffic Noise Model]]
{{clear}}


==Calculations==
==Configuration==
The calculations follow the standard rekenmethode 1 (SRM 1), as described on [http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII]:
{{main|Model attributes (Traffic Noise Overlay)}}


LAeq = E + Co + Cr - Da - Dl - Db - Dm
The Traffic Noise Overlay has a number of options which allow it to be configured as desired. A [[Traffic Noise Overlay Wizard|configuration wizard]] is available.


where:
The following aspects can be configured:
* LAeq: equivalent noise level (dB(A))
* Reference speed per vehicle type
* E: emission
* Noise and noise multipliers per vehicle type
* Co: acceleration term (default = XXX dB(A))
* Background noise
* Cr: reflection term (omitted)
* The hour(s) of the day to perform the calculation for
* 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/]
===Traffic===
Traffic intensities for each type of traffic can be based on one of the following:
* The [[Building attributes (Traffic Noise Overlay)|Attributes of roads]] present in the [[project]].  
* [[Prequels (Traffic Noise Overlay)|Prequel Overlay]]s which define respective traffic intensities on a grid.  


===Emission===
The traffic intensities can be defined as either a single value or as 24 hours, with each value corresponding to each hour of the day. The intensity used for the calculation is then defined by the [[Hours (Traffic Noise Overlay)|HOURS model Attribute]].
Emission is computed as:


E = 10 * log(10^(Elv/10)+10^(Emv/10)+10^(Ezv/10)
==Calculation==
{{main|Traffic noise formula (Traffic Noise Overlay)}}
The Traffic Noise Overlay performs its calculations based on the [[Model attributes (Traffic Noise Overlay)|Overlay's Attributes]], and the [[Building attributes (Traffic Noise Overlay)|Attributes of roads]] present in the [[project]]. The calculations follow the standard rekenmethode 1 (SRM 1){{ref|srm1}}.


Per vehicle category, the emission is computed as:
==Results==
The following result types are available as output from the traffic noise calculations:


Em = am + bm * log(m/v0) + 10 * log(Q/vm)+Cw;m
{{result types|suppresscategory=true|allowselflinks=true|
{{:Noise db            result type (Traffic Noise Overlay)}}
{{:Emission            result type (Traffic Noise Overlay)}}
}}


and
{{article end
|notes=
* The Overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government.{{ref|srm1}}.
|howtos=
* [[How to add and remove an Overlay]]
* [[How to edit an overlay legend]]
* [[How to add a static traffic model]]
* [[How to add a static grid-based traffic model]]
* [[How to add traffic data unaligned with roads]]
* [[How to add a dynamic traffic model]]
|references=
  <references>
    {{ref|srm1
      |name=SRM1
      |author=
      |page=
      |source=Reken- en meetvoorschrift geluid 2012, Bijlage III
      |link=http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII
      |lastvisit=12-02-2022
    }}
  </references>
}}


Cw;m = σm + τm x log(vm/v0,m)
{{TrafficNoiseOverlay nav}}
 
{{Overlay nav}}
where:
 
* m: vehicle category (light weihgt, medium weight and heavy)
* a and b: factors to be found at InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
 
* 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
 
[[File:Geluidsoverlast.png]|600px]]
 
==Adding and removing==
 
{{Editor ribbon|header=3D World|bar=Overlays}}
 
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.
 
{{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}}
 
<gallery>
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}}
 
<gallery>
File:Select3DWorld.jpg|1. Select 3D World
File:SelectEditOverlay.jpg|2. Select Overlays > Edit overlays
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'.''
 
==References==
The overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government: [http://wetten.overheid.nl/BWBR0031722/2016-10-11#BijlageIII wetten.overheid.nl]

Latest revision as of 16:48, 2 February 2024

Traffic Noise overlay

The Traffic Noise Overlay is a Grid Overlay which computes the amount of noise in dB(A) for any given location in the project. The calculation takes into account traffic intensities and a number of environmental- and computation parameters to compute the noise impact. It also takes into account Buildings and terrain features which would block the transmission of noise.

The Overlay only computes noise from traffic. Although a background noise level can be configured, other sources of noise (such as windmills, air traffic, or factories) are explicitly excluded.

Traffic Noise Model

Configuration

Main article: Model attributes (Traffic Noise Overlay)

The Traffic Noise Overlay has a number of options which allow it to be configured as desired. A configuration wizard is available.

The following aspects can be configured:

  • Reference speed per vehicle type
  • Noise and noise multipliers per vehicle type
  • Background noise
  • The hour(s) of the day to perform the calculation for

Traffic

Traffic intensities for each type of traffic can be based on one of the following:

The traffic intensities can be defined as either a single value or as 24 hours, with each value corresponding to each hour of the day. The intensity used for the calculation is then defined by the HOURS model Attribute.

Calculation

Main article: Traffic noise formula (Traffic Noise Overlay)

The Traffic Noise Overlay performs its calculations based on the Overlay's Attributes, and the Attributes of roads present in the project. The calculations follow the standard rekenmethode 1 (SRM 1)[1].

Results

The following result types are available as output from the traffic noise calculations:

Icon Result type Unit Mode Description
NOISE_DB dB The amount of noise in dB experienced at any given location, based on traffic noise and background noise levels.
EMISSION dB The amount of noise in dB emitted by traffic at any given location.

Notes

  • The Overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government.[1].

How-to's

References

  1. ↑ 1.0 1.1 SRM1 ∙ Reken- en meetvoorschrift geluid 2012, Bijlage III ∙ Found at: http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII ∙ (last visited: 12-02-2022)
Traffic Noise Overlay
Model attributes
V0 • Emission start • Emission mult • Hours • Background db • Cars active • Vans active • Trucks active • Buses active
Traffic features
Num cars • Num vans • Num trucks • Num buses
Prequels
Cars • Vans • Trucks • Buses
Result types
Noise db • Emission


Overlays
Categorization
Grid • Parent • Result Child • Result Parent • Result type
Default
City
Administrative
Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Vacancy
Environmental
Heat Stress • Traffic Density • Traffic Noise • Traffic NO2 • Livability • Aerius
Water
Rainfall • Flooding • Groundwater • Subsidence • Watershed • Waterwijzer
Raster Calculation
Average • Combo • Distance • Sight Distance • Travel Distance
Geo Data
Area • Attribute • GeoTIFF • WCS • WMS • Image
Topography
Digital Surface Model • Digital Terrain Model • Underground • Function • Source
Network
Network Distance • Network Overview • Network Ownership


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