VR Scene Dynamic Modeling And Interactive Inquiry Visualization Method For Debris Flow Disaster

Debris flow has the characteristics of rapid flow,large flow,sudden and destructive power,and it seriously threatens people’s life and property safety.Debris flow simulation and visualization analysis in a virtual geographical environment are of great significance to disaster prevention and disaster relief.The existing visualization of debris flow simulation has the problems of poor immersive effect,single interaction mode,and fixed operation interface,which leads to poor user experience and low cognitive efficiency.Virtual Reality(VR)has immersive visual effects,high cognitive efficiency of disaster scenes,and natural human-computer interaction.It has been widely used in games and education.However,in the face of disaster emergency response applications,VR still has problems such as low efficiency of scene dynamic modeling and weak interactive exploration and analysis,and it is difficult to deal with the need for rapid construction and interactive exploration of disaster scenarios under complex and variable scenarios.Therefore,this paper focuses on the dynamic fusion modeling and interactive analysis method of debris flow disaster VR scenarios.The main work and contributions of the paper are as follows:(1)A dynamic fusion modeling method for debris flow disaster VR scene is proposed.Integrated landslide,imagery,simulation analysis and other disaster information related to the debris flow disaster scene are integrated and the dynamic modeling methods for terrain,ground and debris flow scenarios are separately explored,and space location,semantic information,attribute information and the most Good scale information is a fusion modeling rule of constraint conditions,and then a dynamic fusion modeling method of debris flow disaster VR scene is established.(2)An interactive exploration and analysis model for disaster scenarios suitable for VR environment is designed.Explores multi-modal VR scene interaction methods such as bird’seye view,auto-roaming,and mobile walking;on the basis of optimizing organization and selection of many disaster information,breaking through the enhanced expression of text symbols,rapid acquisition of ray focus,and rapid expression of immersive disaster information,etc.Key technologies are designed for efficient interactive query and exploration analysis of VR disaster scenarios.(3)A prototype system was developed and a case area was selected for experimental analysis.Based on hardware and software equipments such as Unity3 D,Visual Studio 2013 and HTC VIVE,a VR scene modeling and interactive analysis prototype system for debris flow disasters was developed.Seven-dimensional landslide debris flow was selected as a typical case area,and dynamic fusion modeling of mudslide disaster VR scenes was carried out.Multi-mode interaction and disaster information query analysis.The results show that the proposed method can effectively support the dynamic modeling and efficient exploration of debris flow disaster VR scenarios,and can provide scientific and technical support for emergency rescue personnel to perform disaster simulation and rescue drills.