Research On Multidimensional Dynamic Visualization Technology Based On Cesium

With the development of various information technologies and the application requirements of some complex disciplines,it is of great significance and practical value to build a world-oriented virtual simulation environment for large-scale strategic application fields such as national homeland security,natural resource management,smart city planning,disaster prevention and mitigation,and hazard simulation.However,the traditional two-dimensional visualization methods have been too limited to reflect all the information of the real space.The development of the integrated data acquisition technology of space and sky makes the data sources of spatial geographic information more and more,and the acquisition means more and more diverse.How to efficiently organize large-scale,multi-dimensional and massive geographic information data and display them in a multi-dimensional and dynamic way in a virtual simulation environment has become an urgent problem to be solved.In order to solve the above problems,this paper focuses on the Cesium framework,using GIS principles,computer graphics,rendering mechanisms and other scene-oriented mathematical principles and techniques,focusing on the virtual globe engine based on rendering optimization techniques,model rendering methods in simulation environment,massive data Rendering scheduling methods and other key technologies for building multi-dimensional dynamic visualization platform,drawing virtual simulation geographic scenes on Web pages,superimposing rich geospatial data,visualizing and analyzing multidimensional data and presenting cases,showing and application of multidimensional spatiotemporal data Explore further.The main work of this paper includes:(1)Deeply study the content of Cesium framework.In the data organization for Cesium,proposing an improved data conversion method.In this way,vector files can be converted into formats to generate the GeoJSON data format required by the visualization platform,which can be computed through the lightweight Web-side(2)Design a fast reconstruction mode of 3D scene based on large-scale cluster processing The flight platform is equipped with an array camera for data acquisition,and experiments are carried out through a fast interactive modeling method based on GPU.The results show that the method can save a lot of time and related personnel configuration(3)The method of visual field culling is improved,and the scene is managed based on the viewpoint distance,and the scene that is projected too large or too small on the display hardware is eliminated,and the scene structure and hardware rendering eff-iciency are optimized(4)The multidimensional dynamic visualization overall framework and related functional modules are designed.The B/S architecture is used to implement a web-free visualization page without plug-ins and lightweight,and to perform scene display,geographic data processing and three-dimensional analysis.