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GIpSynoise's architecture
The objective of the
directive, and thus of each partner regulation, is to carry
out noise maps on an large scale, then to define action plans.
After having analyzed the needs for the cities partners, and done
a state of the art of the existing tools adapted on the scale of the
agglomeration, the tool was built on the basis of:
- A "runtime" of acoustic simulation
- A Geographical Information System software
GIpSyNOISE is thus a specific tool based on the platform ArcView 8.3, including the core calculation CadnaA , adapted to the needs, allowing the analysis of the data according to the European directive.
The choice of the SIG
Arcview, distributed by company ESRI was justified by its opening
capacities and programming facility. The tools used for GIpSynoise
development are:
- ArcMap (standard functionalities of the GIS)
- Space Analyst (calculation of maps)
the GIpSynoise development was carried out in Visual BASIC, with the ArcObject library.
The choice of the CadnaA software, distributed by the Datakustik
company was justified by the following characteristics:
- Software of acoustic simulation by propagation of sound rays since a receiving point
- Calculation of the noise level on a grid of point (horizontal cartography);
- Calculation of the maximum noise level for each building (impact on the population);
- Computing duration optimized with large territories with the adapted parameters of calculation.
A format of entry is defined for the following data:
- topography, buildings, surface property of the grounds, acoustic
barriers, populations (INSEE), use of the ground (residential,
industrial, mixed, etc...);
- characteristics of the sources of road noise (site and width of
the ways, vehicles numbers, speeds, percentage of heavy lorries, type
of traffic, coating, etc...);
- characteristics of the sources of railway noise (site and
structure of the ways, characteristic of the trains, number of trains,
braking, etc...);
- characteristics of industrial sources of noise;
- characteristics of airport sources of noise (importation format).
The input data are consisted 11 files with the Shapefile format, those had to be cut out in surfaces of calculation.
The selected models of
propagation of noise are: NMPB/XPS31-133 for the roads, SRMII for the
railways, ISO9613 for industries and ECAC.CEAC Doc.29 for the airports.
But, in order to give each
user the possibility to combinate results with other specific data, the
GIS basic menus will not be masked. There will be thus a use of
the SIG on two possible levels:
- "synthetic aswer to the Directive"
- "confirmed GIS User"
The data necessary in entry are imported in a quite precise format.
All the data are stored in a Arcview data base. The data necessary to
the runtime CadnaA are prepared and copied in the adequate repertories.
The starting of calculation is done by an order launched from
Arcview.
Calculations of acoustic propagation are carried out, and the results
are recopied in the adequate repertories in the form of
grid of points.
They are stored then visualized on maps or tables of different forms.
• CONTEXT
• TECHNICAL DESCRIPTION
• FOLLOWING WORK
• GREATER LYON METHODS
• GENERAL INFORMATION ABOUT NOISE
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