Prefabricated Concrete Component Geometry Deviation Statistical Analysis

Table 4

Comparison of measurement between the measuring steel tape and photogrammetry system.

Prefabricated	Measuring steel tape (mm)		Photogrammetry system
Prefabricated	−3	9	−1.86	3.46
Beam components	−2	4	−0.82	0.67
	−3	9	−2.03	4.12
Prefabricated	−4	16	−2.08	4.33
Column	−3	9	−2.07	4.28
Components	−3	9	−0.67	0.45
Prefabricated wall	−3	9	0.16	0.02
Panel components	2	4	0.76	0.58
	2	4	−0.65	0.42
Prefabricated	−5	25	3.94	15.52
Composite slab	−3	9	3.05	9.30
Sum		107		43.15
RMSE		0.94		0.60