分块地图矢量数据的符号化方法

Symbolization Algorithm for Tiled Map Vector Data

分层分块的层次细节技术可以提高电子地图绘制的效率,为此提出了分块地图矢量数据的符号化方法;开发了基于间接信息法的通用地图符号库系统。对于面状要素,提出了基于定位点的重复配置符号方法;对于线状要素,设计了基于距离控制的符号化算法和节点间矢量的虚拼接算法。实验表明,所提算法效率高,并且确保分块绘制地图要素的整体显示效果稳定、连续。

A new symbolization method was put forward for tiled map vector data, which caused by level of detail tech- nique. Firstly, the general map symbol system was empoldered based on indirect information block method. Secondly, a area symbolization algorithm based on same orientation was brought forward. Finally, symbolization algorithm based on distance control for linear vector in block and virtual mosaic method for linear vectors among blocks were designed. In despite of rendered in blocks separately, the display effect of vectors was continuous and stabile, and the algorithm had high efficiency.