Anthrax Letters after the 9/11 incident marked the bioterrorism has become a real *** the development of modern molecular biology,the manufacture of biological weapons does not need a lot of money or modern laboratori...
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Anthrax Letters after the 9/11 incident marked the bioterrorism has become a real *** the development of modern molecular biology,the manufacture of biological weapons does not need a lot of money or modern laboratories,and bioterrorism also do not need special training *** to respond to bioterrorism in the crowded area of city,model the potential attacks,carry out efficient risk assessment,and develop a rapid and effective evacuation plan have become challenges in urban *** the basic theory of Virtual Geographic Environments and and human oriented GIS,combined with pathogen diffusion model and crowd simulation modeling techniques,this article aims to explore the methods of bioterrorism simulation and risk assessment in 3D micro-spatial ***-level grid based spatial data model,multi-hierarchy path finding algorithm,and the methods of combining cellular automata and multi-agent system are put *** the Olympic Park station of Beijing Metro Line 8 as a typical study area,a simulation and visualization system is implemented,and experiments are conducted in three *** the experiments,the exposed population in polluted areas,the optimization evacuation plan,the key monitoring area,the number of infected people and so on can be obtained at every computation step for supporting rapid and efficient emergency decisions in different simulation scenarios.
Aiming at the integrative management and comprehensive applications of large-scale 3D geospatial information covering the full 3D space of a city, this paper briefly introduces the design and implementation of a full ...
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Aiming at the integrative management and comprehensive applications of large-scale 3D geospatial information covering the full 3D space of a city, this paper briefly introduces the design and implementation of a full 3D GIS platform: GeoScope, which provides a professional solution for the massive full three-dimensional geospatial data integration, management, analysis, visualization, and applications. GeoScope is characterized by: (1) extendible software architecture based on the hierarchical message bus, facilitates multimodal integrative applications of 2D GIS and 3D GIS;(2) unified 3D city models, support multiscale semantic representation of outdoor & indoor and aboveground & underground 3D objects;(3) high-efficient 3D geospatial database engine, supports integrated management of massive 3D geospatial data for real-time applications;and (4) high-performance visualization engine exploiting the massively parallel computation architecture of modem GPUs, supports real-time realistic rendering of large-scale complicated 3D geospatial environments. The successful pilot application of GeoScope is also illustrated with the 3D city models of 8494 km2 of the whole Wuhan City, the largest city in middle China.
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