Research And Implementation Of Typhoon 3D Visualization Technology

At present,with the rapid development of computer technology,visualization technology has been more and more widely used in many fields.Typhoon disaster is one of the natural disasters with the highest frequency of occurrence,the largest impact range,and severe losses.Typhoon visualization has also become a hot research direction in the field of meteorological visualization.Applying the technology of data visualization to the field of typhoon meteorology can transform a wide variety of obscure data into intuitive graphical visualization results.Compared with the massive numbers far beyond the acceptance of human brain,intuitive and rich graphic images can more effectively help meteorologists analyze meteorological data and study typhoon laws,and provide good auxiliary means for disaster prevention publicity and post-disaster assessment.Thereby further improving the research progress of typhoon meteorology.Therefore,it is of great value and significance to develop a visualization platform for typhoon meteorological data.This thesis systematically introduces various techniques used in the visualization of typhoon data,mainly from the static and dynamic aspects of the typhoon.The main innovations and the main work completed in this thesis are as follows:1.Propose a new method of color mapping.By comparing several other mapping methods,this thesis proposes a streamline coloring method based on integral color mapping.This method performs color mapping according to the number of field strength data points,so that the color distribution on the streamline can more accurately express the vector field strength information,and the layered sense of the flow field strength is significantly enhanced.2.Use the Ray Casting algorithm in volume rendering method to draw 3D typhoon clouds and improve the traditional Ray Casting algorithm.Compared withthe traditional GPU-accelerated ray casting algorithm,using acceleration techniques such as early ray termination,resampling technique based on space jump,and fast interpolation,the algorithm in this thesis not only ensures the quality of image rendering,but also improves the rendering speed.3.For how to freely display the relevant information of typhoon data.Firstly,this thesis compares and evaluates the advantages and disadvantages of three common interpolation algorithms.and improves the bilinear interpolation algorithm.The algorithm integrates a variety of meteorological element data,which not only ensures the quality of image rendering but also improves the rendering speed,and provides a good help for typhoon analysis.Secondly,an arbitrary section analysis method based on spherical proxy geometry was designed and implemented,and the custom region cutting of typhoon volume data was completed.This method not only makes the data processing more flexible,but also has rich display angles and strong effects.4.Based on the particle system,this thesis implements and enhances various dynamic visualization effects of typhoons,including storm surge,2D particle convection and 3D particle convection.Firstly,this thesis uses the dynamic noise mapping method based on HSV to achieve the visualization of the storm surge movement process.Secondly,the Luminance algorithm is used to grayscale the RGB values after the integral mapping to complete the simulation of the typhoon cloud map.Finally,the Lagrangian method is used to track the 3D particles,and the 3D streamlines are drawn.In this thesis,real-time visualization of typhoon information is realized,and the typhoon is displayed intuitively through a variety of 3D visualization methods,which enriches the visualization effect.Based on the above work,this thesis uses Open GL's ork package library and GLSL as the basis,Qt and HTML as the GUI development framework,and develops a meteorological plug-in on the existing three-dimensional digital earth platform.This system can not only present the historical meteorological historical data directly,but also based on the plug-in development design,this platform is easy to expand.It can design corresponding functional modules and user interaction interfaces according to different visualization methods.The method used in the research in this thesis and the conclusions drawn from the experiments provide a certain reference value for the visible field of typhoons,and it can be used as a reference for technology and methods in the application of typhoon disaster prevention and mitigation.