The Research And Design Of Digital Three-Dimensions City

With the development of computer technology and communication technology, digital technology and network technology have brought profound changes to the word.As an important component of the information society,Digital Earth and Digital City have rapid developed.As a platform for the operation of Digital City, interactive interface is provided by the visualization of virtual city for Digital City. Virtual City is based on virtual reality Simulation technology.The main form of expression is digital cities.The research of virtual city has become one of current research hotspots.In this thesis,the author will focus on the research of the three-dimensional simulation platform,present the modeling of three-dimensional simulation and implementation platform of the city.The paper is divided into five sections.At first,the development of the virtual city and the virtual reality technology in China and abroad is reviewed,and the significances of three-dimensional simulation of urban construction is demonstrated in this paper.In the process of three-dimensional simulating urban construction,a detailed research is done to the key technologies which include three-dimensional modeling,web platform for graphics operations,mass data management. Secondly,the main research of three-dimensional simulating urban is the platform. As three-dimensional graphics simulation data acquisition,this paper uses three-dimensional modeling techniques and,presents a series of the production process of three-dimensional simulating the city,including data acquisition, modeling,post-processing,graphics storage.As dealing with the map of three-dimensional simulating city,this paper focuses on JavaScript grid map data operation of the relevant technology,realizes the basic functions of the future operation,such as the map loading,dragging,zooming and narrowing.It makes a good foundation for the following platform research.For the data loading technology of three-dimensional simulation,this paper refers to the innovative concepts of hotpoint and substance,which means each building identified as a hotpoint or substance,and build the reality of the geographic information data with the hotpoint or substance.It has more extensive data than the traditional two-dimensional map.The database alternative technology is also a key technology in three-dimensional simulating platform.At last,the database security,smart sub-word search,mass data content and realizing of the link of whole platform will be researched in this paper.Three-dimensional simulating the real terrain and land features.It provides the users the virtual urban environment like a real-life environment.Through the digital platform management,urban plan,construction and operational management, security management,decision-making support,which are provided by the visual three-dimensional information services.It can greatly improve the urban spatial information sharing and the level of urban management using,so as to provide a means of the decision-making visualization to improve the efficiency of urban management,and achieve the sustainable development of cities.