Abstract: Focus on the visualization of GIS-based evaluation area traffic noise environmental impact assessment (EIA), the boundary lines generating algorithm followed on the centre line of the road is presented. A method for the Cartesian grids generation with sound area self-adaptive grids refinement algorithm is provided to the complex evaluation area for the unstructured grids generation. Based on the unstructured grids, the equivalent sound level EIA model for evaluation area is proposed and the visualization of the EIA calculation is achieved. Through the visualization and analysis of an elevated highway example, the accuracy and efficiency of the proposed methods are confirmed.

Key words: traffic noise, environmental impact assessment, visualization, geographic information system