Using the urban environment noise emission and propagation model

also considering the attenuation impact of buildings and tree belts on noise

an urban environment noise simulation and evaluation system named “Zhong Da Sheng Tu” was developed with the help of geographical information system(GIS). The noise emission，propagation model of point

line and plane source were set up in the system. As for the traffic noise of line source

GIS was used to obtain the information of roads and buildings. The road traffic noise distribution of urban area was calculated with the vehicle noise emission model. The calculation results were imported to GIS to make the traffic noise map. At last

the system was used to simulate the urban traffic noise and evaluate the effect of noise reduction measures

results show that the systems algorithm is accurate and efficient.