An open-source tool to build urban noise maps in a GIS

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1 An open-source tool to build urban noise maps in a GIS IRSTV FR CNRS 2488 Nicolas FORTIN, Erwan BOCHER, Gwendall PETIT Ifsttar Judicaël PICAUT Laboratoire Régional de Strasbourg Guillaume DUTILLEUX

2 Summary Introduction Why an open-source GIS Description of the method Illustration Application Conclusion

3 Introduction Strategic Noise mapping in the EU [2002/49/EC] EU action plans for decreasing noise exposure Main action by optimising Urban mobility plans Testing several scenarios using standard approaches : Complex process Time consuming Need for a simplified approach: Propose a 2D simple approach of the French standard method NMPB 08, with low computation time (~a day) Include the method in a open source GIS software: OrbisGIS

4 Introduction Why an open source GIS 1. Quality of software 2. Latest software technology 3. Harness the entire power provided by the GIS 4. Ability to submit new features and fix 5. Easy deployments, multi-platform

5 Description of the method General procedure

6 Description of the method Noise emission from traffic data Using data like : Average vehicle speed Light vehicle/hour Heavy vehicle/hour Tram vehicle/hour Speed limitation Road category ex: Highway 2x2 Reference spectrum for each vehicle category Computation of the frequency distribution of the sound pressure level in 1/3 octave bands from 100 to 5000 Hz

7 Description of the method Propagation: domain calculation and meshing Parallel computing, split the domain into sub-domains: For noise mapping, quality constrained Delaunay triangulation of a sub-domain:

$reflected (order n), diffracted$ (m=1) Calculation of sound

8 Description of the method Sound propagation paths For a given receiver: research of all propagation paths: direct, reflected (order n), diffracted (order m) Diffracted field (m=1) Calculation of sound level for each path Direct field Reflected field (n=1)

9 Description of the method Integration within OrbisGIS

10 Description of the method Integration within OrbisGIS

11 Description of the method Integration within OrbisGIS

12 Illustration Comparison with regular sound maps (Nantes, FR) Calculation with standard method Directive 2002/49/CE «NoiseMap» Plugin

13 Application Study of Nantes urban mobility plans scenarios 3 scenarios tested: Scenario 1: Uniform decrease of the light vehicle demand by 25%. Scenario 2: Uniform increase of 20% of public transportation. Scenario 3: Doubling fuel prices.

14 Application Study of Nantes urban mobility plans scenarios Methodology: Calculation of the maximum sound level on frontage: IGN topographic data (1) Calculation of urban population data by building: statistical data bank from INSEE IRIS units (2) Calculation of the noise exposure (related to the population) for each building (3)

15 Application Study of Nantes urban mobility plans scenarios

16 Application Study of Nantes urban mobility plans scenarios Results: LDEN 2008 base year Scenario 1 Scenario 2 Population Number % Number % < 50 db db db db db db >75 db Nantes population : (INSEE 2008) Number % Scenario 3 Number %

17 Application Study of Nantes urban mobility plans scenarios Results : Map of limit values exceeded (>68 db)? Base year : hab Scenario 3: hab

reported to the IRIS units (>68 db) Base year Total

18 Application Study of Nantes urban mobility plans scenarios Results: Map of limit values exceeded by population and reported to the IRIS units (>68 db) Base year Total population Scenario Scenario Scenario

19 Conclusion New alternative to classical tools in order to produce noise maps using only Open Source software Reduce manipulation time and computation time Prospects From 2D to 2D½: vertical diffraction and topography More documentation and tutorials Information to French collectivities

Thank you for your attention Contact: Erwan Bocher (IRSTV): Judicaël Picaut (Ifsttar): erwan.bocher@ec-nantes.fr Judicael.Picaut@ifsttar.fr More information about OrbisGIS: http://www.

20 Thank you for your attention Contact: Erwan Bocher (IRSTV): Judicaël Picaut (Ifsttar): More information about OrbisGIS: Sources: Acknowledgements: Authors wish to thank the French National Research Agency for providing financial support (Project ANR-08-VILL-005)

Practical Introduction to OrbisGIS V3.0

Practical Introduction to OrbisGIS V3.0 Partners Contribution E. Bocher & G. Petit IRSTV - FR CNRS 2488 - Ecole Centrale de Nantes, France O P E N R SC OE UO P P O R T U N I T I E S IN Summer School 28th