Improved Methods for the Assessment of the Generic Impact of Noise to the Environment 6th Framework Programme, Area 1.2.1, Policy-oriented research, contract number Modelling requirements and input data collections Dirk Van Maercke IMAGINE Final Conference

No.2 IMAGINE Final Conference, Budapest, 25 October 2006 The missing link… Harmonoise methods GIS & external data sources Physical model geometry + acoustical properties Thematic data model “Features with geometry” Requirements Feasibility

No.3 IMAGINE Final Conference, Budapest, 25 October 2006 The physical model = a physical model describing the emission and the propagation of sound 2D PATH DETECTION 2D POINT-TO-POINT Estimation of excess attenuation Diffraction, ground reflection, meteorological refraction, scattering,… Source segmentation Homogeneous propagation sectors Direct and reflected paths, Diffracted paths over/around obstacles

No.4 IMAGINE Final Conference, Budapest, 25 October 2006 The thematic model Road surface Driving lane Embankment Building Roof Walls Water Natural terrain Relief Screen Error !

No.5 IMAGINE Final Conference, Budapest, 25 October 2006 External GIS data

No.6 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements

No.7 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements Level of detail: -1 Source height Receiver height Propagation distance Ground classification Level of detail: 0 Roads: width Buildings: height

No.8 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements Level of detail:1 Relief : altitude ? Breaking lines !

No.9 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements Level of detail: 2 Road: 1 source per lane Relief: digital terrain model Low Barriers

No.10 IMAGINE Final Conference, Budapest, 25 October 2006 Sensitivity analysis

No.11 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements Area to be mapped Terrain relief Buildings Road infrastructures Railway infrastructures Ground surfaces Industrial areas Airports Road traffic Railway traffic Industrial activities Aircraft operations Meteorological conditions Checklist for input data collection

No.12 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements FEATURE / PROPERTYCOMMENTS RELIEF Breaking linesTop and foot of embankments, shoulders, verges, transition from road/railway infrastructures to natural terrain, hill tops… are more important than smooth terrain shapes or regular slopes. It the DTM has an accuracy < 1m everywhere, explicit breaking lines are not necessary. Digital terrain model: height lines, points, interpolated surface, TIN,…

No.13 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements BUILDINGS Floor plan (2D projection)Intersection of the building walls with the terrain. As a rougher estimate, the projection of the building’s roof on the ground can be used. UsageThe usage of the building is an essential parameter for the estimation of exposed populations. It is recommended to differentiate at least three usage classes, possibly with sub-classes: dwellings (houses and apartments), sensitive buildings (schools, hospitals, homes,…) and other buildings (industrial, commercial,…) Number of floorsThe number of floors is more important to the estimation of exposed populations than the total height of the building to the determination of noise levels. Total height of the building Height per floor Altitude of base contourIf known, altitude information at the base contour of buildings can be used to refine the DTM. Roof shapesRealistic roof shapes instead of a single flat roof polygon.

No.14 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements GROUND SURFACES Overall characterisationThe whole area under study is characterised by a single impedance class : hard, mixed or soft The area under study is divided in smaller parts and each is assigned a single impedance class: hard, mixed or soft Hard surfacesIf the site is classified as globally soft or mixed, hard surfaces representing parking lots, large water surfaces,… should be added locally (if > 100m²). Soft surfacesIf the site is classified as globally hard or mixed, soft surfaces representing parks, gardens, grassland,… should be added locally (if > 100 m²). Detailed surface modelCoverage of the area using all possible impedance classes. Surfaces should be aggregated in areas > 100 m²

No.15 IMAGINE Final Conference, Budapest, 25 October 2006 Modelling requirements Detailed input data Detailed model Low resolution input data Simplified model Harmonoise & Imagine Generic data Modelling solutions Simplification & economisation

No.16 IMAGINE Final Conference, Budapest, 25 October 2006 Thank you for your attention…