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.
For Delft noise map:
For Paris noise map: