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Strategic Noise Mapping and Action Planning
Noise Mapping, Noise Exposure Calculation and Action Planning compliant with EU Directive 2002/49/EC for major agglomerations (including industrial sites and ports), major roads and railways and major airports
Calculation Methods
IMMI fully supports the requirements of Directive 2002/49/EC for interim and national computation methods. All 4 interim computation methods, including the adaptations described in Recommendation 2003/613/EC, are available in IMMI. In total, more than 20 national computation methods are disposable in IMMI.
According to Directive 2002/49/EC the following calculation methods are recommended:
- NMPB/XP S 31-133 + Guide du Bruit (1980) - interim computation method for road traffic noise
- SRM II - interim computation method for railway noise
- ISO 9613-2 - interim computation methods for industrial noise
- ECAC.CEAC Doc. 29 (1997) with segmentation technique - interim computation method for aircraft noise
- Furthermore, Member States may use their own national computation methods. In that case equivalence with the interim methods must be shown.
Calculation of strategic noise maps
IMMI calculates all four noise indicators simultaneously: LDay, LEvening, LNight and LDEN. The grid cell size may be defined by the user. Typically it would be 10 m by 10 m. The calculation heigth is 4 m above the ground compliant with the requirements of the Directive. In addition, the height of 1,5 m that is also referenced in the Directive or any other height that may be requested by your national transposition can be defined by the user.
In IMMI noise indicators are calculated separately for each type of noise source. Furthermore, IMMI enables the user to calculate global noise level maps (i.e. by energetic addition of the the noise maps calculated separately for each source).
Distributed processing on many networked PCs or multi-core computers (or a mixture of both) of large-scale noise maps is possible with the AUDINOM feature of IMMI.
Noise Exposure Calculation
IMMI features all requested noise exposure calculations of land-size area, dwellings and population.
The strategic noise map is both the basis for the calculation of the land-area exposed to certain noise level bands and the definition of the noise exposure bands according to ANNEX VI of the Directive.
In IMMI each building can carry a series of attributes such as non-residential, residential, school, hospital and kindergarten. The "residential" attribute identifies buildings for which both the number of people and the number of dwellings exposed to certain noise levels are calculated. The attributes "school", "hospital" and "kindergarten" identify sensitive buildings. The number of buildings per noise level band is counted for these attributes.
The number of people exposed to noise is determined by means of façade level calculations on residential buildings. The number of inhabitants can be assigned to each individual building by means of any of the following methods:
- direct input
- import of existing digital data (see here for
data import filters) - statistical approximation on the basis of gross living area per inhabitant, building volume and number of storeys
- deduction of the population density of a land-use area or statistical sectors
2 methods are available to assess the number of people exposed to noise:
- proportional exposure: proportional attribution of the number of inhabitants of a given building to each façade level point.
- highest level exposure: in compliance with Directive 2002/49/EC all inhabitants of a building are assigned to the level of the most exposed façade.
Further information can be found here 
Feature: façade level calculation.
Further program features
- data input: mouse, keyboard, digitising tablet
- integration of terrain level and development
- user-selectable speed-up calculation mode
- facade level calculation to determine most exposed and quiet facade
- automatic backup functions save the current state of the project during editing and calculation
- definition of variants to calculate test cases and planning scenarios
- import and export via DXF and ArcGIS Shape files