Research On Display Technology Of Evolution Process Of Landslide And Debris Flow Based On WebGl And Animation Technology

China's diverse natural geography and complex geological structure make frequent geological disasters in China,and landslides and debris flows are the main types of disasters.Therefore,how to reasonably study disaster data to achieve the purpose of disaster warning and disaster avoidance has become a problem to be solved..This subject aims to study the web-side display method of the evolution process of landslides and debris flows,and provide scientific researchers with a basis for rapid evaluation and analysis.The research on 3D visualization on the Web has developed to a certain extent,but it is limited by large data volume and high computational difficulty,and has few applications.At the same time,traditional 3D visualization technology requires the installation of plug-ins or loading components,which has poor compatibility.Based on this consideration,a three-dimensional dynamic evolution process display method of landslide and debris flow based on Web GL technology is designed.Web GL is a standard 3D drawing protocol for the Web.It uses Java Script programs to run 3D effects in a browser without downloading and installing other rendering plug-ins.It can also be consistent across different browsers and hardware platforms,and uses GPU to accelerate rendering.But at the same time,Web GL was not born very long,the documentation was incomplete,and the public information on geological disaster visualization on the Web was almost blank,which brought some difficulties to the development of this article.The process of visualization of geological data from data to model is often realized through 3D software modeling.Therefore,researchers have to learn the modeling software and raise the threshold of research.First,this paper constructs a three-dimensional modeling data model and a dynamic evolution data model for landslides and debris flows.It uses digital elevation(DEM)data based on regular grids for mountain modeling,and innovatively realizes the direct conversion from data to three-dimensional models.At the same time build a multi-level detail(LOD)model of DEM data,and use LOD-based methods to accelerate rendering.Secondly,this paper implements a display algorithm for the evolution process of landslides and debris flows.It uses a pre-processed data model to perform triangulation to generate a three-part model structure of a mountain terrain model,a landslide body model,and a debris flow surface model based on the triangulation.,Using Web GL's programmable rendering pipeline for realistic rendering.And adopt the tween animation technology and the request frame animation mechanism to realize the dynamic effects of landslide sliding and debris flow.While completing the conversion from the data to the 3D model,we also considered the visualization solution of the model exported by the 3D software,and realized the modeling and display mode based on the gl TF model.Finally,a web-based display platform design is constructed to provide a good display effect and interactive experience of the landslide and debris flow evolution process.Through the above work,it provides users with an innovative method from geological data to geological 3D visualization,skips the process of modeling using local data and 3D software,and assists scientific researchers to quickly analyze,predict and The purpose of the decision.