ESDV - Environmental Software & Digital Visualization

- Customizing the Full-Scale Traffic Simulation Software for Your City (FSTSS-YC)

ESDV, as an only service vendor in the world, uses professional leading technology to provide customizing ‘The full-scale traffic simulation software for your city’ (FSTSS-YC), in order to make a thorough and scientific understanding of the local traffic exhaust pollution. After overcoming the common insufficient of traditional multi-line source Gaussian dispersion models (which only can be used in the so-called ‘micro-scale region’), FSTSS-YC can then calculate the levels and details of the inert pollutants (CO, PM10 and PM2.5, etc.) with the urban scale, emitted by the motor vehicles both on highways and from queue links; display and analyze 2 & 3D images of the pollutant concentration field on a plane with some height to the datum; and also deduce the scenes and variations of traffic exhaust plumes. See ‘Customizing a Full-Scale Traffic Simulation Software for Your City’, ‘What is FSTSS-YC ?’ and ‘Main technology exhibitions of FSTSS-YC’ at


The urban managers, researchers, engineers, environmental workers, public health experts and teachers and students in universities and secondary schools, who are willing to conduct quantitative research, scientific analysis and precise control of vehicle exhaust pollution for a specific city/region, are the potential users of FSTSS-YC.

Customization process of FSTSS-YC:

●Users provide one or more digital maps with correct scale for a specific city;

●The customizer builds FSTSS-YC software based on the above digital map(s);

●Users make their own files of surface roughness factor Z0 for corresponding digital map(s) or entrust the customizer to make them;

●Users learn how to use FSTSS-YC through the help file or through training;

The producer can also provide users with the following services:

a. Installing the atmospheric profiles of the specific urban for the user;

b. Developing additional GUI functions for users' professional needs;

c. Adjusting the default variable limits for users (but the total limit is less than 2GB);

d. Entrusting to calculation and providing corresponding research reports;

e. Transferring the computer software copyright.

●The innovative algorithm and corresponding simulation software, supported by the Z0 database of specified urban surface roughness factor, are developed by transforming a series of EPA's(USA)finite line-source Gaussian dispersion models, famous worldwide, which is only applicable to the ‘micro-scale region’, into a way that is also applicable to the urban scale region.

●Through dialog boxes, tables and simple operations on digital maps to input the data about road positioning, traffic parameters, meteorological parameters and receptor's disposition, etc..

●The map-support tool for pre- and post-processing, including geometrical data collection, digital map background, map enlargement and shrink, storage and printing, etc..

●Generating the surface roughness factor Z0 file(s) through clicking on gridding digital map, which have the function to store, display, correct and build up the produced Z0 file(s).

●The computing engine can provide three algorithms: a.) Z0 is a constant value, this is the traditional algorithm of original model, applicable only to the ‘micro-scale region’; b.) Z0 is the arithmetic mean of computing domain, the valuation is more reasonable than a.); and c.) Z0 is the arithmetic mean at the local area within the blowing process range under the wind direction for each link. Users can choose appropriate algorithms flexibly according to the calculation problems.

●The graphics  of up-to-date 2- and 3-D pollutant concentration distribution field can be provided, including generated three 2-D concentration contour displays and six types of 3-D graphics, which can rotate around Z-axis. Users no longer need to use other commercial drawing software.

●Easy to use the analyzer on calculated results, which functions include the point-by-point display of mouse coordinates and model-calculated concentration value (point analysis), and display and analysis of various characteristic concentration values within a towed rectangular region.

●Once calculation can quickly simulate, predict and analyze the pollutant concentration values at several designed points or the concentration distribution field at a certain height, caused by the motor vehicle exhaust gas emission.