关键词: 矢量 多分辨率 可视化 四叉树

Abstract:

This paper proposes a method for multi-resolution modeling, organization and three-dimensional display of GIS vector （points,lines, polygons） data In the preprocessing phase, the multiple representation of vector data is extracted by vector simplification algorithms, then each representation layer  s partitioned into small blocks which are used to construct the hierarchical vector data quad-tree in a bottom-up way. At run-time a synchronous threa  is employed to schedule vector data blocks specified by the view-frustum culling results and screen space error metrics. Experimental results show that the proposed approaches can satisfy the requirements of real-time rendering of large-scale vector data, which benefit from the multi-resolution data anization and data scheduling scheme

Key words: vector, multi-resolution, visualization, quad-tree