True Three-dimensional Geographic Information Systems, Massive Data Processing Technology Applied Research

With the spreading of the concept of "Digital Earth", the geography information digitalization has become an important application in the field of traditional science, such as geography, which computer technology is used. To describe the data set more intuitional and practical, the trend of GIS from 2D to 3D is undoubted. And it is a hotspot nowadays.Meanwhile, 3D visualization is popular because of its live presentation and easy-to-understand. How to integrate 3D visualization technology into the legacy geography system? It is a significant theme.Generally speaking, there will be a very large quantity of data in normal geography system especially spatial data as well as image data. In addition, most of GIS data are complicated especially in some certain of professional applications.On the other hand, we can't load the whole data set into the memory because of the present hardware limit. To resolve the bottleneck, we should concern about how to schedule data effectively, how to simplify data according to the current viewpoint and environment context, how to render the scene rapidly by rendering algorithm, such as Level of Detail.At the same time, most of GIS applications are based on stand-alone system. The corresponding optimized algorithms are also stand-alone based. But with the complexity and the great capacity of GIS data, as well as the real time and interactive feature of geography system, the performance of stand-alone system is not meet the application requirements very well. To resolve the problem, a reasonable solution is to transplant the system to a distributed parallel environment.In this paper, we mainly focused on Level of Detail algorithm and distributed data schedule that is mentioned above.