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Progressive Transmission of Vector Line Data
Author(s): 
Pages: 17-20
Year: Issue:  3
Journal: HYDROGRAPHIC SURVEYING AND CHARTING

Keyword:  地图综合曲线化简流媒体;
Abstract: 网络环境下的空间数据采用从低分辨率到高分辨率逐级追加细节信息的"流媒体"传输,可以使用户在感到显示的信息能满足要求时随时暂停传输,从而提高传输效率,同时辅助从粗到细的信息导航.然而,矢量空间数据要实现这种渐进式的传输与可视化方式,要比栅格、DEM、TIN结构的空间数据复杂.基于Douglas曲线化简算法,在曲线层次化剖分基础上,将综合化简的中间过程由二叉树作完整的记录,通过序列三角形的连续叠加,实现曲线的"流媒体"传输.
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