Advancement of three-dimensional noise mapping in Hong Kong

The dramatic enhancement of computation power, rapid development in Geographic Information System (GIS), three-dimensional (3D) computer graphic and virtual reality technology; and the wide availability of digital topographic and mapping data have facilitated the substantial advancement in road traffic noise assessments and data presentation in Hong Kong. Two-dimensional (2D) and even 3D noise mapping over a large geographical area has now become a more manageable task. In Hong Kong, very often roads are in close proximity to the sky-scrapers and 2D noise mappings are simply inadequate in accurately portraying the noise exposure environment. Traditional commercially available noise modelling tools are incapable of handling the complex topography, building geometry and noise screening structures of Hong Kong. 3D presentation tools integrating noise modelling, GIS and computer graphics are needed to portray the noise environment in the unique high-rise townscape of Hong Kong. This paper outlines the development of advanced 3D GIS tools, information technologies and how they were put into trials and implementation in Hong Kong. Particular attention is given to the dissemination of noise information to the community, be it for public education, engagement or consultation; and recent advances in the availability of such information interactively, and in a user-friendly manner, through the internet.