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在路线测量时,我们总把经纬仪架在交点桩(I.P.)上,做控制点打导线,测交角的。但是在打弯道时,就不然了;总要移动仪器,把仪器架到曲线始点(B.C.)或曲线终点(E.C.)处进行。如果曲线中间有障碍物或地形复杂,还得需要再动仪器。尤其在山区道路测量上,这种测法更不方便,不但费事,也较麻烦。往往由于移动仪器,造成的窝工浪费很多,也不经济。现介绍
In the course of measurement, we always put the theodolite stand on the intersection point (I.P.), do the control point to play wire, measured angle. However, it is not the case when you hit the corner. Always move the instrument and move the instrument to B.C. or E.C. at the end of the curve. If there are obstacles in the middle of the curve or the terrain is complex, you have to move the instrument again. Especially in the mountain road measurement, this measure is more inconvenient, not only trouble, but also more trouble. Often due to mobile instruments, resulting in a lot of waste labor, it is not economical. Now introduced