Traffic Noise Overlay

What is the Traffic Noise overlay?

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.

Adding and removing

To add a traffic noise overlay go to the Overlays menu in the GEO DATA ribbon and select Add Traffic Noise. To remove the overlay, press Remove below the overlays list.

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

References

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

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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

Water

Rainfall • Flooding • Groundwater • Subsidence • Watershed

Grid Calculation

Average • Combo • Distance • Sight Distance • Travel Distance • Inference • Iteration

Geo Data

GeoTIFF • WCS • WMS • Image • Area • Attribute • Function

Topography

Satellite • Digital Surface Model • Digital Terrain Model • Underground • Source

Network

Network Distance • Network Overview • Network Ownership