An Oracle8i-based approach is proposed to manage the integrated databases oflarge CyberCity.This approach consists of three schemes:①a special R+-tree index is designed toaccelerate spatial retrieving,in which the bo...An Oracle8i-based approach is proposed to manage the integrated databases oflarge CyberCity.This approach consists of three schemes:①a 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;②different 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;③in 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.展开更多
基金Project supported by the National Key Basic Research and Development Program(No.2002CB312101)the National Natural Science Foundation of China(No.40001017).
文摘An Oracle8i-based approach is proposed to manage the integrated databases oflarge CyberCity.This approach consists of three schemes:①a 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;②different 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;③in 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.
