Method and system for surveying reference points on construction

Abstract

Respective targetsare set at a plurality of reference points Sto Sprovided on a construction. 3D measuring instrumentis firstly installed at a central site O of the first polygon Gthat has apexes at three or more of the reference points S, and measures 3D coordinates of the reference points in the first polygon Gin a predetermined coordinate system, from 3D vectors for the apexes of the first polygon Gwhich are collimated by the 3D measuring instrument. The 3D measuring instrumentis then moved to a central site P(n) of an n-th polygon G(n) (n being an integer of 2 or more) that has apexes at three or more of the reference points whose coordinates have been measured and one or more of the reference points whose coordinates have not been measured, and measures 3D coordinates of the post-movement location P(n) of the measuring instrumentand the reference points in the n-th polygon G(n) whose coordinates have not been measured in the predetermined coordinate system, from 3D vectors for the apexes of the n-th polygon G(n) which are collimated by the measuring instrument. After measuring 3D coordinates of all the reference points on the construction by repeating a cycle from the step of moving the 3D measuring instrumentto the central site of the n-th polygon G(n) to the step of measuring 3D coordinates of the reference points in the n-th polygon G(n) whose coordinates have not been measured, 3D coordinates of each reference point S are determined through network-adjustment calculation.