Abstract
To grasp the noise level near roads is very important to control the noise pollution caused by vehicular traffics.
A prediction model of ambient noise level (L50) in the vicinity of roads was established. The model based on EPA model (E.A.G. Shaw and N. Olson, 1971), so the sounds propagation characteristic was considered as exp(-β )/r2, where r is the distance from a source to an observed point and β is an excess attenuation coefficient. Furthermore, an excess attenuation coefficient was so derived as to fit the results of leda's model (S. Ieda et al., 1983).
In our model, the building coverage rate plays the most important role in sound propagation. The rate was estimated from five kinds of band data (excepting midle and thermal infrared bands) of Landsat TM data (September 6, 1984) in Osaka district. The principal component analysis method and multi-regression analysis were used here. The correlation coefficient betweeen estimated values of building coverage rate from Landsat TM data and ground truth data was 0.915.
The model was applied to an actual area in Osaka prefecture, and somewhat good result was derived.
