测绘中常用的一些制图符号，以及内业展点程序。主要包括： 围墙、栏杆、道路、圆堤的定义绘制，坐标正算反算程序，读取文件在CAD中进行展点。(Some cartographic symbols used in surveying and mapping as well as internal exhibition procedures are presented. Mainly include: The definition of the fence, railings, roads, roun