Traffic Noise Overlay: Difference between revisions

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[[File:Traffic_Noise-Overlay.jpg|thumb|right|Traffic Noise overlay]]
[[File:Traffic_Noise-Overlay.jpg|thumb|right|Traffic Noise overlay]]


The Traffic Noise Overlay is a [[Grid Overlay]] which computes the amount of noise in Db(A) for any give location in the [[3D World]]. 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 [[Construction|object]]s and [[Elevation model|terrain features]] which would block the transmission of noise.
The Traffic Noise Overlay is a [[Grid Overlay]] which computes the amount of noise in dB(A) for any give location in the [[3D World]]. 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 [[Construction|object]]s and [[Elevation model|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.
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.
{{clear}}
{{clear}}
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==Configuration==
==Configuration==
{{main|Model attributes (Traffic Noise Overlay)}}
The Traffic Distance Overlay has a number of options which allow it to be configured as desired. A [[Traffic Noise Overlay Wizard|configuration wizard]] is available.


The following aspects can be configured:
* Reference speed per vehicle type
* Noise and noise multiplies per vehicle type
* Background noise


==Calculation==
==Calculation==
{{main|Traffic noise formula (Traffic Noise Overlay)}}


The calculations follow the standard rekenmethode 1 (SRM 1), as described on [http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII]:


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


{{result types|suppresscategory=true|allowselflinks=true|
{{:Noise db            result type (Traffic Noise Overlay)}}
{{:Emission            result type (Traffic Noise Overlay)}}
}}


{{article end
{{article end
|references=
|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]
* 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  
|howtos=
|howtos=
* [[How to add and remove an Overlay]]
* [[How to add and remove an Overlay]]
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{{Overlay nav}}
{{Overlay nav}}
The Traffic Noise Overlay is a [[Grid 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>
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==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 
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 [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]]
==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]
==How-to's==
* [[How to add and remove an Overlay]]
* [[How to edit an overlay legend|Edit an overlay legend]]
{{Template:Overlay nav}}

Revision as of 15:32, 10 February 2022

Traffic Noise overlay

The Traffic Noise Overlay is a Grid Overlay which computes the amount of noise in dB(A) for any give location in the 3D World. 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 objects 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.

Configuration

Main article: Model attributes (Traffic Noise Overlay)

The Traffic Distance 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 multiplies per vehicle type
  • Background noise

Calculation

Main article: Traffic noise formula (Traffic Noise Overlay)

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

How-to's

References

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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