Abstract: The existing numerical simulation research methods focus on the study and expression of the mechanism of landslide sliding process,lack the display of information before and after disasters,and are difficult to present the complex spatio-temporal process of disaster scenes.The virtual geographical environment can reproduce the spatio-temporal process of disasters,realize the visual expression and sharing of disaster information,and is of great significance to the modernization development of disaster emergency management.To this end,this paper proposes a visualization method for landslide disasters with enhanced spatio-temporal evolution,achieving the integrated modeling of landslide numerical results and multi-source geographical entities.It enhances the expression of the spatio-temporal evolution process of landslides through multi-level semantic constraints and multi-dimensional visual variables.Develop a prototype system to conduct experiments and analyses,display the geographical scenarios of disasters in the front-end system,and fully realize the visual enhancement and visualization expression of the processes before,during and after disasters.Studies show that this method can effectively integrate the numerical results of landslides with virtual geographical scenes,providing more intuitive and information-rich visualization support for the spatio-temporal evolution process of disasters.

Key words: virtual geographical environment, landslide disaster, enhanced visualization, semantic constraints, numerical simulation, multi-dimensional visual variable