Case Study: Noise Maps

A noise map is a graphic representation of the sound level distribution. Noise maps are used for calculating the areas affected by noise, determining the number of sensitive buildings affected by high noise levels, getting noise prediction models. The spatial database and spatial analyzing tools of GIS is useful to monitor the effect of noise and its impact.

European Union Member States are required to produce strategic noise maps in their main cities.

What are the necessities for a noise map?

3D city model of the area

Software packages: ARCVIEW/GIS, (ArcMap, Spatial analyst, 3D analyst, and ArcScene extension), standard noise calculation software, Point Cloud Mapper (PCM), FIELDS

The steps for 3D noise maps:

Step 1: Collection of data

Step 2: Building 3D city model, extracting and organizing the data about the objects of the 3D city model for noise calculation.

Step 3: Generating the 3D noise observation points and building 3D noise model.

These observation points represent location of virtual microphones where the noise levels are to be calculated. The acoustic indicators can be determined by computation or measurement methods. However, computation methods are widely preferred. Noise levels are calculated at each observation point by using noise calculation software.

When results are obtained, spatial interpolation was applied to give a continuous graphical representation of sound levels by using GIS tools.

3D noise map shows the volumetric view of noise levels on the road surface of study area.

These are the 3D noise map and noise contours of the Delft. Inhabitants on lower floors are more affected than on upper floors.

The size and position of noise barriers can be decided most optionally using 3D noise models. Higher barriers located close to the road are more effective to prevent the noise.

For more information about noise maps:

http://www.navcon.com/citynoisemap.htm

For Delft noise map:

http://www.gem-msc.org/Academic%20Output/Kurakula%20Vinay.pdf

For Paris noise map:

http://www.v1.paris.fr/commun/v2asp/fr/environnement/bruit/carto_jour_nuit/cartobruit.h

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