摘要
An Oracle8i-based approach is proposed to manage the integrated databases oflarge CyberCity. This approach consists of three schemes: ① a special R+-tree index is designed toaccelerate spatial retrieving, in which the bounding boxes of local regions have no intersection andall leaf nodes of the R+-tree (geometry records ) have no repetition; ② different data compressionalgorithms are adopted to compress the digital elevation models, 3D vector models and images, suchas LZ77 lossless compression algorithm for compression of vector data and JPEG compressionalgorithms for texture images; ③ 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.
An Oracle8i-based ap-proach is proposed to manage the inte-grated databases of large CyberCity.This approach consists of threeis designed to accelerate spatial retrieving, in which the bounding boxes oflocal regions have no intersection andall leaf nodes of the R+-tree (geome-try records ) have no repetition;rithms are adopted to compress thedigital elevation models, 3D vectormodels and images, such as LZ77lossless compression algorithm forcompression of vector data and JPEGcompression algorithms for texture im-Oracle8i database, a CyberCity GISspatial database engine (SDE) is designed. On the basis of this SDE pro-totype a case study is done.
基金
Project supported by the National Key Basic Research and Development Program (No. 2002CB312101)
the National Natural Science Foundation of China (No.40001017).
