The pollution concentration distribution in the vertical scale has been paid more and more attention. So, it is greatly significant to research 3D simulation of atmospheric diffusion in environmental monitoring. With 3D GIS, a Gauss pollution diffusion system, which is based on the Gaussian diffusion model and the multiPatch model, is constructed by boundary value calculation, building triangle strip, multipatch interpolating and rendering. The migration process of air pollution and a 3D diffusion model generation algorithm are also introduced. Moreover, the dynamic diffusion process of SO₂ in a factory is simulated by 2D and 3D schemes, based on which the characteristics of spatial distribution are achieved and the maximum landing distance is obtained as 206 m. The practical application of the system shows that the way of 3D simulation based on the multipatch model is effective and suitable for profile computing and spatial analysis in 3D space.

air quality assessment  /  Gauss pollution diffusion system  /  3D GISS