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本文用三种交会法导出的公式表明,测区首级控制点点位误差对各级插点精度的影响,随着加密次数增多而逐渐减少,因此直接用于施工放样的控制点精度,主要取块于测量本身精度和上一级控制点精度,并根据测区地形条件、施工放样的精度,对首级工程控制网的边长、等级的选择具有一定的实用意义.
In this paper, the formulas derived from the three rendezvous methods show that the influence of point error of the primary control point of the survey area on the accuracy of interpolation points at all levels gradually decreases as the number of encryption increases. Therefore, the accuracy of the control points directly used for construction stakeout is mainly taken as Block in the measurement of its own precision and the accuracy of a control point, and according to the terrain conditions of the survey area, the accuracy of construction lofting, the first engineering control network side length, the level of choice has some practical significance.