公路的横断面测法,一般都是用手水平仪按梯级的方法,一级一级地进行测量。但由于受到平测的限制(指如同抄平一样),转点很多,各转点间的距离也短,尤以在山岭地区,路线均沿斜坡前进,每一断面常有不需要的转点夹在中间,并因在野外只做记录,还须内业加以整理,才能绘到断面纸上,因此工作极不方便。兹举例如下(记录有括弧的是经过整理的数字): Cross-sectional road test, usually by hand level by step method, one level to measure. However, due to the limitation of flat test (referring to the same as copying), a lot of turning points, the distance between the turning points is also short, especially in the mountains, the routes are along the slope forward, each section often unwanted transition point Caught in the middle, and only recorded in the field, but also the industry to be sorted in order to draw the cross-sectional paper, so the work is very inconvenient. Here’s an example: (The parentheses are collated numbers):