| In the advent of Windows Vista and dual-core CPU, under the guidance that computer hardware and software technology continues to improve the situation, more and more pressing comprehensive development is needed for the field 3D visualization. In the face of the strong impact of Google Earth, when people shrink At Goble, they will also be able to see the different scales of geographic information, 3DGIS domestic workers faced with tremendous challenges, but whether foreign or domestic software products in the field of the current "Digital Earth", there is a common problem: the first, As a commercial software, Google Earth and the LT Earth not have the function of Earth-demo; second, as a network software product, Google Earth and LT Earth without exception which need to network servers to download large amounts of data, resulting in the local show at a sluggish; Third, the system Development costs and market prices very high, in fact greatly limits the use value, in particular, should not be able to play the Digital Earth in all directions education.3D digital earth can be considered a subset of Digital Earth, involved in the development of the principles and methods in three-dimensional visualization of GIS in the field of one of the most basic and effective structures. A number of independent intellectual property rights of the three-dimensional globe System, is one of the key steps to the ultimate realization of a Digital Earth. 3D digital globe can be widely used in industry, agriculture, education and social life in various fields.The powerful features OpenGL 3D digital globe for the system provides a good development platform, and with three-dimensional computer visualization of the development, OpenGL features will become more compatible with the trend of stability. Through OpenGL, software technology and to study theories, especially the number of in-depth study of the Earth, making three-dimensional structures of the digital globe has become possible, the paper by the object-oriented software design completed a three-dimensional methods for the initial development of Digital Earth, for the formation of a set of Independent intellectual property rights of software system launched a series of experimental research. Papers in conscientiously sum up Visual C + + object-oriented programming language and OpenGL functions under the premise of their respective advantages, and find the development of the experiment and the possibility of reliability, then discussed in the Visual C + + development platform under the OpenGL-based 3D Digital Earth Instrument Modeling Principle and the development of technology, that complete the prototype software system design, detailed feasibility studies, development and implementation of analysis and evaluation. Its main contents include: (1) Earth three-dimensional model of instrument. Try to use different ways to create a model of the earth, and analyzed and summarized the characteristics of different methods, (2) 3D digital globe teaching function is achieved. Around the Earth and its software system in the teaching function, a large number of experiments, in the face of the initial realization of the core functions of teaching is done. (3) 3-D digital globe to achieve the basic functions of GIS. Mainly based on the 3D sphere of GIS information functions and spherical distance measurement, the information function break through for the functional limitations of the traditional two-dimensional GIS, so the software system has laid a solid theoretical foundation and technological accumulation for the future to further improve.
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