MithraSIG, acoustic simulation software for outdoor environments

Noise mapping, simulating the propagation of acoustic waves in an outdoor environment

The European directive on the management of environmental noise, as well as French regulations, now require the production of strategic noise maps in order to limit and prevent noise pollution in the vicinity of certain road, motorway and rail infrastructures, as well as in certain conurbations. Environmental noise has become a major issue at national level and in other countries. More and more laws are being passed requiring acoustic studies to be carried out.

Assessing noise impacts using noise mapping

MithraSIG is a GIS-based acoustic simulation software. The Geographic Information System (GIS) provides openness and durability, with a wide-range of formats maintained for both reading and exporting, advanced drawing and editing features, analysis and rendering. The GIS used is Cadcorp SIS, which was initially chosen by IGN on behalf of CSTB.
The software has a broad scope of application, modelling noise pollution in the vicinity of road, motorway and rail infrastructures, as well as noise from building sites, wind farms, ports and any other neighbourhood noise (point sources, etc.).The tool also determines the proportion of the population

Brochure

A sound mapping solution resulting from the collaboration of two experts

MithraSIG is the result of collaboration between 2 specialists in their field: The CSTB (Scientific and Technical Center for Building), a recognised expert with 40 years of research in acoustics - Page 3 / 8 the MITHRA code - provides calculation engines representing the state of the art in terms of rigour and performance.

Geomod, an expert in geomatics, renowned for its fast response times in development and the quality of its user support, provides its development and integration expertise.

High-performance, ultra-complete acoustic mapping software

A simple, comprehensive package

Because you have a wide range of needs, all types of sources are included from the first licence level , so you can carry out all types of acoustic simulation projects : road, rail and industrial sources, ray tracing, data analysis and cross-referencing. The only limitation is the number of objects.

Railway and tramway sources use the SNCF's database of railway convoys.

Industrial sources (point, line, facade or surface) use the Imagine database (European project) and offer more than 1,200 sources.

Fast, rigorous calculations

Drawing on the expertise of CSTB, MithraSIG combines speed and precision in its calculations.

MithraSIG's acoustic wave propagation simulations use high-performance algorithms based on asymptotic methods such as ray tracing and adaptive beam tracing.

By design, the algorithms used are suitable for forecasting in a closed environment, such as the centre of a city with a high building density, as well as in an open environment with vast spaces between buildings, or in mountainous sites where the ground relief influences propagation.

MithraSIG benefits from the expertise and Research and Development work of the CSTB.

Compliance with standards

The physical calculation engine calculates noise propagation in accordance with the requirements of current regulations, in particular European Directive 2002/49/EC, taking into account the effects of meteorological conditions.

Geometric engines ranging from fast ray tracing to beam tracing for diffraction on the vertical edges of objects.

64-bit multi-processor computing (multithreading) using the latest available technologies.

Calculation methods: CNOSSOS-EU, NMPB2008 (octave and 1/3 octave), ISO9613, NMPB96 (XP S31- 133), Harmonoise (1/3 octave).

A solution tailored to the size of your projects

MithraSIG is just as suitable for simulating the acoustics of a project in a town, conurbation or department as it is for carrying out an impact study and a local noise prevention plan.

Because every project is different, several licence levels are available, based on the number of objects taken into account in the calculation model (excluding terrain):

Up to 100 objects.
Up to 1,000 objects.
Up to 10,000 objects.
Up to 100,000 objects.
Unlimited objects.

A simple, intuitive interface

MithraSIG has been designed so that you can easily create your model.

Thanks to a simple and intuitive interface, model creation is fast. It can be created either by integrating data from different organisations, in different forms and formats, or manually using the drawing tools.

Over 160 formats supported (SHP, MIF/MID, TAB, DXF, DWG, DGN, etc.).
Automatic project creation from SRTM and OpenStreetMap data, enabling you to create acoustic simulation projects quickly.
Advanced tools for creating and editing objects that take full advantage of the richness of GIS.
Dedicated wizards for creating themes, spatial queries and printouts.

MithraSIG  allows you to create both vector and raster renderings with an extremely sophisticated map creation tool. Simple tickboxes can be used to define all the parameters of a map: indices, sources, frequencies, colour palette, rendering type and accuracy. The map display changes in real time as these parameters are modified. So it's easy to set up and create your map quickly

4 types of mapping: vertical, horizontal, building facades and userpositioned receiver maps.
Presentation of results in the form of tables, maps, cross-sections and 3D views.
Real-time updates after traffic modifications, index changes, source activation/deactivation, etc.
Creation of differential maps (before/after installation of infrastructure, increase/decrease in traffic or speed, etc.).

Decision-making and communication support

MithraSIG  stands out for the quality of the documents produced during acoustic simulation, in particular the dynamic PDFs (with layers, diagrams and geo-referencing). The small size of the PDF files allow the renderings produced to be transferred by e-mail.

In addition, MithraSIG also enables the maps produced to be distributed in a variety of formats, including:

Export to KMZ, which allows, among other things, visualisation in Google Earth™.
Export to software for real-time fly-through of virtual models.
Export to over 50 formats, both vector and raster (SHP, TAB, ECW, JPEG, TIFF, BIL, etc.).

MithraSIG  can also be used to measure the acoustic impact of future projects in terms of the population affected. The 2D and 3D maps are fantastic communication tools. They provide an objective opinion in public debates linked to a new infrastructure or a new development