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在施工现场进行施测作业时一般是把仪器直接架设在中线一个控制点上(中线原点),对准相应的另一个控制点,进行放射投点。如遇到中间障碍物多,不能通视时采用“正倒镜法”进行投点,此法特点是:一方面在远距离进行投点时,可将仪器置于、A·B两点中间直线上的中部,这样,就可以缩短视线,减少照准误差和不考虑对中误差;另一方面如遇两已知点互不通视时,可置仪器于能窥视两已知点的地方设站进行投点。 一、基本原理 1.设AOB为已知直接的三点,k在O点置经纬仪.正镜(盘左)照准A点后倒转
In the construction site of the test operation is generally the instrument directly erected in the midline of a control point (midline origin), aimed at the corresponding another control point for radiation casting. In the case of more than the middle of obstacles, can not be used when the “inverted mirror method” to vote, this method is characterized by: on the one hand in the long-distance investment point, the instrument can be placed in the middle of A · B Straight line on the middle, so that you can shorten the line of sight to reduce the sighting error and does not take into account the error; the other hand, in case of two known points do not communicate with each other, the instrument can be set to peep at two known points Station to vote. First, the basic principle 1. Let AOB known direct three points, k at the O Theodolite. 正 镜 (disk left) A spot after reversing