3.1.1. Scan Strategy

The small-scale high formwork model set located on a moving equipment, the scanning position, and the control points for the laboratory trial are shown in Figure 3. The moving equipment can move freely along X, Y, and Z direction at submillimetre level. Targets were used for post-processing data registration in a common reference frame. A Trimble total station was used to survey control points and targets in order to build a control network. The observations were adjusted to minimize the errors. The resulting coordinates were corrected to within 1 mm. The Trimble TX5 3D laser scanner was used to carry out the scans and collect point cloud data. The small-scale model located on the moving equipment move from 1 mm to 10 mm at interval 1 mm along X, Y, and Z directions, respectively. In every 1 mm movement, the model was scanned once, and thus, the model was scanned 30 times in total.
