关键词: 真三维GIS, 关系数据库, 海量体数据, 八叉树

Abstract: In geoscience field,the massive volume data has become a bottleneck problem for the development of true 3D GIS.Because of the low performance of database access techniques,the traditional massive volume data organization relies heavily on file system.But this method has great limitation,such as the insecurity and poor share of data,concurrent access abnormality,data redundancy,and lack of managment.To solve these problems,a new space division method,the homologous octree,is proposed in this paper.Furthermore,a massive volume data organization method based on relational database with its strategy for space search,multiresolution,data swapping between main memory and external storage is also demonstrated.The practice shows that the performance of this method will meet the need of the actual applied requirements，such as 3D visualization.Since the relational database is the most practical and popular kind of database,this method has a better practical value and application prospect.

Key words: true 3D GIS, relational database, massive volume data, octree