工程地形图自动绘制系统

Automatic Plotting System for Engineering Topographic Map

介绍了工程地形图自动绘制系统实现过程中所采用的几个有效技术。系统中开发了“地面断层”算法，并且通过对三角网的动态变化，来保证等高线走向的合理正确，同时构造了一个实用三样条函数，解决了等高线稠密区拟合时易发生相交这个较难解决的问题。并利用维消隐算法解决了地物图示符号之的１交叉覆盖问题。

The paper presents several effective technique adopted in the imple-mentation of an automatic plotting system for the engineering topographic maps。In the system developed is the algorithm of fault surface,and the reasonable and correct inclination of contours is ensured by the dynamic variation of trangular net.The construction of practical cubic spline functions will solve the difficult problem of common occurrence of crossing contours in the adoptation of smooth,ing procedure in areas of depse contours。A D hidden line algorithm is also proposed to remove the intersection among symbols of surface feature。