The Three Dimensional Visualization Research Based On OpenGL

The informatization tidal wave has influenced the globe since the 20th century. Abundant, timely, exact and reliable information is very important for us.Abundant, timely, exact and reliable information is very important for us. With the appearance of the "digital earth", It is necessary and feasible to construct a huge .digital and visualized information system .which is based on data visualization.After studying the three-dimension visualization technology, I find it has two main shortcomings. First, the technology, which integrates the three-dimension terrain and groung objects by GIS, is not satisfying. Second, the technology, which analyses the information of the internal objects, the objects' spatial character and its attribution by GIS, is not mature.This paper attempts to solve the two problems above with VC++ and OpenGL. And there are five parts in this article.Chapter one: instuction. It is composed of the following contents: the significance of the three-dimension visualization; the main softwares of three-dimension visualization and their shortcomings; the solution and the procedure of the article.Chapter two: the important technology of three-dimension visualization. For example, the method that how OpenGL is used in VC++; the technology of three-dimension ground objects and data storage; the principle of three-dimension terrain and data storage; the integrity of three-dimension terrain and objects and so on.Chapter three: the procedure of the three-dimension visualization. This part analizes elaborately how the three-dimension visualization is reliazed.Chapter four: the practical study for the three-dimension visualization. This part gives a case of three-dimension visualization .which is based on a tourism district in Xun Yang city, ShaanXi.Chapter five: conclusion. The main solution and the difficulty to the integrity between terrain and ground objects of three-dimension are concluded.the job in the future is put forward.