Real-time collaborative cartography based on region version by quadtree index
基于四叉树索引的区域版本实时协同绘图系统

As the traditional GIS develops towards Internet GIS, the update of maps usually needs the integrated cooperation of several websites. The traditional concurrency control strategy does not satisfy the collaboration awareness of multi-users in cooperative GIS. Therefore, regional version concurrency control strategy by quadtree index was suggested, and its frame and methods for correlative issues were given.