Multi-dimensional Visualization For The Dispersion Simulation Result Of Atmospheric Pollution Based On GIS

Sudden atmospheric pollution accident has many characteristics,such as wide pollution range,fast spreads speed,which causes huge losses.Rapid real-time diffusion visualization of the atmospheric pollution can know intuitively the pollution diffused features,such as concentration range,direction,attenuation trendency,et al.,which can provide a valuable reference for predictive analysis and emergence response of the accident.The existing visualization method of air pollution dispersion model cannot be effectively integrated with geographic information and lack some important dimensions,et al.The spatial-temperal multi-dimension visualization expression of the atmospheric pollution dispersion model simulated results based on GIS can show air pollution dispersion spatial distribution effectively and has important theoretical significance and application value.CALPUFF is an advanced,integrated Lagrangian puff modeling system for the simulation of atmospheric pollution dispersion,which considers the effects of the terrain factor and can efficiently simulate pollutants dispersion status with time and space.In this thesis,we will take the CALPUFF model as an example to investigate the spatial-temperal multi-dimensional visualization expression method.The main research contents are as follows:(1)CALPUFF model and its data preprocessing:Firstly,we analyze the calculating flow of CALPUFF model,and provide integration solutions between the CALPUFF model and the GIS component.Then the input data pretreatment methods for different types of the model are discussed and given.Finally,combining with GIS data visualization technology,the simulation output data visualization method,including vector marking method of wind field data and raster rendering method of concentration field data,were investigated and given.(2)The multi-dimensional expression of CALPUFF model simulation results in virtual scene:We provide the building process of virtual scene,which includes three-dimensional terrain and three-dimensional blocks,and gives the integration process of CALPUFF model and GIS under the virtual scene.Then the visualization methods in the virtual scene,including the dynamic simulation of wind field and concentration field based on the image attributes and the multilayer visualization of wind field and concentration field based on the layer loading,was discussed.Finally,the multi-dimensional volumes model expression of concentration field based on Interactive Data Language(IDL)was invested and discussed.(3)The three-dimensional simulation prototype system of atmospheric pollution under the virtual scene:Using WPF system framework,we designs and implements a three-dimensional simulation prototype system for atmospheric pollution in the virtual scene.The system implements and integrates multi-dimensional expression method given before.The results show that the integration solutions can effectively integrate CALPUFF model with three-dimensional GIS;and that spatial-temperal multi-dimensional expression method can realize the dynamic dispersion simulation on the temperal dimension and the vertical distribution simulation on the spatial dimension.