自动矢量化后等高线处理研究

Research of Processing Contour Line after Automatically Vectored

等高线是地形图中反映地貌形态特征的基础地理信息数据,其自动矢量化后普遍存在毛刺和断点连接等问题,该文提出基于毛刺生长点的邻域搜索剔除毛刺法和复合连接法等解决方法。在CAD环境下通过VBA编程对技术方案进行验证,结果表明该方法具有连接速度快、准确率高等优点。

The contour line is the basic geographic information data that reflects the physiographic symbol and characteristics. After automatically vectored of contour line, there are still such problems as burrs and breakpoint connection, and this paper aims to give solutions for these problems On the one hand,it proposes a neighborly search method to eliminate the burrs based on the burr growing point during the process of data preproeessing. On the other hand, it puts forward a composite connection method to connect the breakpoints after deeply analyses the causes and types of the disconnection of contour lines. These technological methods mentioned above have been proved in CAD environment by using VBA program,which shows that the composite connection method is not only practicable but also fast and accurate. Therefore, the methods proposed in this paper are both helpful to perfect and improve the data accuracy of contour line after the automatically vectored and beneficial to its research.