Fig. 1. Simple roads models' multi-granular noise bars projection

Fig. 2. Local noise of a single point sound source and two point sound sources

Fig. 3. Multi-granular local noise of a single point sound source

Fig. 4. Real roads models' multi-granular noise bars projection

Fig. 5. Noise map on the Web

Fig. 6. Local noise maps at different moments

Fig. 7. Local noise maps at different map zoom levels

Fig. 8. Local noise maps represented by different visual variables at the same time and the same map zoom level