Preliminary Design Of Three-dimensional Visualization Geographic Information System Based On OpenGL

As people demand for three-dimensional information increasingly, three-dimensional visualization technology has been widely used in various fields of society, such as military,environmental, traffic, real estate, digital cities and so on. According to people's needs of three-dimensional software , and through contrastive research and analysis the status of the three-dimensional software at home and abroad , it proposes three-dimensional visualization of geographic information system design proposal.Comprehensive display three-dimensional scene, spatial analysis, mass surface features model management, three-dimensional perspective control are commonly used to design visualization software.Using these technologies synthetically, it adopts a software design process and the general type of design method, and designs a three-dimensional visualization geographic information system based on OpenGL.In the spatial data management, it mainly expounds the system of data organization and management, and also discusses the database structure design of three-dimensional data processing module and three-dimensional scene display module in detail. In system design, it proposes system development methodology and process design, and also discusses the agitarone of system architecture, system function, system modules and system interface in detail. Finally, it was described the realization of the part function module. System module is divided into three-dimensional model processing module and three-dimensional scene shows. Three-dimensional scene shows is the main module.The system module is designed to roam, observing, analyzing and calculating , multimedia information expression , position coordinates and query on the map in the three-dimensional scene .All of these two modules achieve unified management and scheduling about remote sensing images, vector maps, digital elevation models and three-dimensional scene data.