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水准测量中,如果水准仪的视准轴与长水准器的水准轴在铅垂面内存在平行度误差i(下简称i角误差),必须及时校正。校正i角误差,可在室内,也可在室外。本文介绍室外定量校正方法。 1.建立室外校正体系如图1所示;在室外合适场地的大致一条轴线上,量取A、B、C和D各点,其距离分别是:AB=60m,AD=AB/2=30m、AD-BD<10mm,BC=5m。在A、B两点设立并固定标尺A和B,C、D是架设仪器的位置。从A、B标尺的观测值求得的高差h,是定量校正的数据,故规定了AD与BD的
In the leveling survey, if there is a parallelism error i (hereinafter referred to as i-angle error) in the vertical plane between the sight axis of the level gauge and the level gauge of the long vial, it must be corrected in time. Correct the angular error i, indoors, but also outdoors. This article describes the outdoor quantitative correction method. 1. Establish an outdoor calibration system as shown in Figure 1; measure points A, B, C and D on roughly one axis of a suitable outdoor site at distances of AB = 60m and AD = AB / 2 = 30m , AD-BD <10 mm, BC = 5 m. Set and fix ruler A and B at points A and B, where C and D are the positions where the instrument will be erected. The height difference h obtained from the observations of the A and B scales is a quantitatively corrected data, so that the AD and the BD