Research On Visualization Model Of Geological Landslide Based On Monitoring Data And Implementation Of Application Algorithm

Landslide occurs frequently and widely in China,which seriously endangers the safety of human life,and causes economic and property losses.The rapid simulation of landslide evolution process is helpful to understand the disaster situation comprehensively,and it is important to the formulation of disaster relief plan and the development of emergency rescue.At present,the research of landslide mainly focuses on static mechanics analysis,and the research on dynamic visualization of landslide process is based on mathematical model,which is complex and depends on a lot of data.Therefore,based on the geological monitoring data and the construction of three-dimensional terrain,this paper focuses on the evolution model and technical method of rapid simulation of landslide process.The research work and results are as follows:(1)An Improved Quadtree LOD 3D terrain construction algorithm is proposed.Based on the DEM data of regular grid,this paper studies the storage structure of terrain and the way of grid rendering,establishes the node evaluation system with the view distance,surface roughness and view speed as the influencing factors,and adopts the view clipping strategy based on bounding box to realize the fast rendering of 3D terrain modeling.On this basis,the crack phenomenon and jump problem in the algorithm implementation are analyzed,and a layer level difference limited algorithm for control node partition is proposed.Finally,the performance of the algorithm is compared and analyzed from the frame rate and the number of triangulation,and the influence of control factor,view speed and sight distance on terrain rendering is discussed respectively.The experimental results show that the algorithm can greatly reduce the amount of terrain node rendering data,and achieve better visual effect.(2)The visualization scene of landslide disaster is constructed,and the dynamic visualization display and interactive analysis system of landslide process are designed and implemented.According to the requirement of fast simulation,based on the threedimensional terrain structure,the area of landslide occurrence is determined by using the digital elevation data before and after the disaster,and the surface triangle network model of landslide area is established.Then,based on HTML5 and webgl technology,the dynamic visualization scene of landslide is designed by using the mechanism of circular rendering and mapping flow.A web end landslide process visualization simulation system is established based on the experimental data area of sadongpugou landslide in the yaruzangbu River,Tibet.The experimental results show that the method proposed in this paper can effectively support the rapid simulation of landslide disaster occurrence process,and provide good user interaction experience,and achieve the purpose of assisting scientific researchers to make quick analysis,prediction and decision-making.