Research On The Technologies Of Collaborative Plotting Based 0n Database Sharing

As the development of the international environment, the frequent occurrence of natural disasters, as well as the rampant terrorist activities, the world are paying more attention to the public security, and it has become a focus of Governments and the public.The foundation of Public Security Emergency Response System is helpful to conduct the prevention, analysis, emergency response and strategic implementation for the public security emergency. Public security emergency treatment required leading under the joint operational department, should not be restrict to an isolated department. Emergency Response Operation Picture will be able to show real-time information about emergencies, the deployment of emergency response personnel as well as some other environmental elements in the geographical space through the form of situation plotting. Meanwhile, it will be the best platform to eliminate the phenomenon of "Information island "and" Command island". Because of the characteristic of the emergency response of public security by the joint operational department those are fast-paced and broad collaboration, the traditional map plotting has obviously unable to meet the requirements. We should actualize the multi-user collaborative plotting activity based on database sharing in modern network environment.Collaborative plotting based on database sharing involves many questions, it's very difficult to achieve, so the relaced technology and theoretical summary are needed urgendy. How to implement it in C/S and B/S network environment, which are the main questions researched by this thesis.Firstly, considering the necessity of setting up Public Security Emergency Response System , the paper analyzed the significance of System and it's existent questions, as well as the necessity of collaborative plotting based on database sharing, introduced the present research on Public Security Emergency Response System and collaborative plotting; Secondly, through the research on the database access technology, CSocket communication technology and SVG, clarified the theory foundation and work principle of collaborative plotting based on database sharing in C/S and B/S network environment; Thirdly, Start from the establishment of emergency operation symbol system , situation information storage and management based on Spatial, the actualization of situation plotting functions in the stand-alone computer, the actualization of collaborative plotting in C/S network environment, achieved the collaborative plotting based on database sharing in C/S network environment; Fourthly, start from the expression of operation symbol model based on SVG, network transmission and situation representation on client, synchronous collaborative plotting, plotting data access and user account management and security, researched the collaborative plotting based on the shared database in B/S network environment; Finally, start from emergency response GIS platform, database management module, emergency response planning demonstrating module and emergency response collaborative plotting, introduced an instance of collaborative plotting based on database sharing ----- Public Security Emergency Response System Of HeNan Province.At the end of the thesis, summarized the main job of the thesis and clarified the direction for further research...