A Visualization Method Of Earthquake Disaster Information Coordinated By Symbolization And Realism

Earthquake disasters have the characteristics of wide coverage,large data volume,complex and diverse disaster objects,and uncertain interactions,which seriously threaten people's lives and property safety.Rapid construction of three-dimensional disaster virtual scenes,visual display of earthquake disaster information and spatial interaction analysis can provide important scientific basis for earthquake disaster emergency rescue and emergency disposal command.Although much research has been done on the modeling and visualization of earthquake disaster scenarios,there are still problems such as low efficiency of disaster scene construction,difficulty in disaster information recognition,and difficulty in sharing geographical knowledge.In view of the above issues,this paper focuses on the 3D visualization method of earthquake disaster information based on disaster symbols with the support of HTML5 and WebGL technology,through breakthrough symbolic and 3D scene collaborative expression,rapid construction of disaster scenarios,network information release and interactive exploration.Analysis and other key technical methods to achieve efficient display and sharing of seismic disaster information.The main research work and achievements of this paper are as follows:(1)To propose a visualization method of symbolic representation and 3D disaster scene collaborative expression.Through the classification and summarization of the disaster information data at different stages of the earthquake,the characteristics of the disaster objects and their visual expression methods are analyzed.The design principles and expressions of the seismic disaster symbols are studied.The symbolic and three-dimensional scenes are expressed in a collaborative way to achieve efficient and visual representation of earthquake disaster information.(2)Rapid construction and release of three-dimensional scenes of earthquake disasters.Through the unified classification and efficient organization of pre-earthquake,disaster,and post-disaster scene modeling data,the three-dimensional scene of earthquake disasters can be quickly constructed;and then multi-source disaster data can be uniformly converted into compact,lightweight,and parsable data.The format realizes the rapid web publishing of disaster information;finally,scene interaction analysis functions such as scene roaming,disaster information query,and two or three dimensional linkage are designed to realize the visual expression and interactive exploration and analysis of seismic disaster information in the whole process.(3)Prototype system development and case experience analysis.Taking Jiuzhaigou Earthquake in Sichuan Province as an experimental case,and based on WebGL technology and Cesium open source framework,a 3D visualization prototype system for seismic disaster information was developed.The symbolic and 3D scene collaborative expression,3D disaster scene construction,web publishing and interactive analysis were integrated.Key technologies,and carried out experimental analysis.The experimental results show that the method proposed in this paper can effectively support the rapid construction and sharing of earthquake disaster scenarios,which will help improve the cognitive efficiency of disaster information.