3D surveying method for components incorporated into structures

Abstract

To provide a three-dimensional measurement method of a member capable of achieving highly accurate measurement in a short time, from a ground surface easily, without climbing up to a measurement object member, in measurement of a high building structure.SOLUTION: A three-dimensional measurement method comprises: a first step of selecting, as reference points, multiple points having a height coordinate value different from that of a measurement object member from a range of a structure or the like; a second step of acquiring photograph image data about the measurement object member and a range including the respective reference points by using a photograph image data measurement instrument; a third step of acquiring a reference point coordinate value which is made into a three-dimensional coordinate value by using a three-dimensional measurement instrument; a fourth step of acquiring imaging point group data from the photograph image data; a fifth step of performing calibration applying the reference point coordinate value with respect to a calibration three-dimensional coordinate value in the imaging point group data and acquiring a calibrated imaging point group data; and a sixth step of calculating a distance between the measurement object points, on the basis of the calibrated imaging point group data.SELECTED DRAWING: Figure 1

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