摘要：An Oracle8i-based approach is proposed to manage the integrated databases of large CyberCity. This approach consists of three schemes: a special R -tree index is designed to accelerate spatial retrieving, in which the bounding boxes of local regions have no intersection and all leaf nodes of the R -tree (geometry records) have no repetition; different data compression algorithms are adopted to compress the digital elevation models, 3D vector models and images, such as LZ77 lossless compression algorithm for compression of vector data and JPEG compression algorithms for texture images; in order to communicate with Oracle8i database, a CyberCity GIS spatial database engine (SDE) is designed. On the basis of this SDE prototype a case study is done.
关键词：Cybercity; spatial database engine; R -trees; Oracle8i database
