等高线自动矢量化的后处理

Post-Processing of automatic vectorized contour lines

为了更好的实现等高线自动矢量化的后处理工作,包括数据预处理(剔除毛刺和矢量数据压缩)、断点连接、接边检查和等高线赋值等。对于等高线数据压缩问题,采用了一种较好的压缩方法——Douglas-Peucker算法。通过解决断点连接问题,提出了端点趋势连接方法,建立矩形框缓冲区、趋势比较和距离判断进行层层筛选,将符合要求的等高线进行连接处理的方法,提高了连接的速度和效率,为等高线后处理工作提供了指导和帮助。

In order to the post-processing work of automatic-vectorized contour lines realized greatly, including pretreatment （eliminating burr and reducing vector data）, breakpoint connection, back-checking and evaluating the contour lines and so on. For the problem of data compression ,the writer adopts a preferable method of compressing -Douglas-Peucker arithmetic. Through settle the problem of breakpoint connection, It puts forward a Wend-vertex method of joining. Constructing square frame, comparing trend and estimating distance to filtrate, joining the contour lines those meet the requirement, this methed increases the speed and efficiency of joining, providing instruction and helping for data collection.