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Study on P2P-Based Distributed Vector Geo-Data Online Service

FENG Jia-li1,JIANG Nan1,2,HU Bin2,WU Jia-gao3,ZOU Zhi-qiang3(1.School of Geographic and Oceanographic Science,Nanjing University,Nanjing 210093;2.Key Laboratory of Virtual Geographical Environment,Nanjing Normal University,Ministry of Education,Nanjing 210046;3.Institute of Computer Technology,College of Computer,Nanjing University of Posts & Telecommunications,Nanjing 210003,China)  
P2P technology offered a novel solution to spatial information online service and a good platform for sharing mass spatial data,it can avoid"single point of failure"and "hot spots bottleneck"problem,which exist in traditional centralized system of spatial information.P2P oriented raster geo-data online service has been widely applied,whereas vector geo-data online service still has many issues can′t be handled,such as vector geo-data organization pattern,segmentation,lossless reconstruction,etc.In this paper,the data organization of vector geo-data and distributed topology was especially researched deeply.The Hybrid Chord+Quadtree Indexing network was adopted to manage peers to improve query efficiency and realize load balancing.Key technology of P2P-oriented distributed vector geo-data online service was researched,and the pattern of vector geo-data organization based on Linking Mechanism,segmentation and lossless reconstruction were proposed in this research.This novel organization pattern recorded link relationship between all levels in the Linking information in tile in order to form a loosely distributed topology,and support lossless reconstruction.Tile was designed to be organized by"Tile-Geometry-LinkingNode"hierarchical model to form a distributed topology.Segmentation and lossless reconstruction method took advantage of linking information,to reconstruct the damaged Geometries.Comparative experiment shows that the organization and the associated algorithms to be robust,efficient and complete.
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