Extraction of Feature Information from Point Cloud of Large Volume Steel Truss Members

Table 3

Error detection of boundary and corner point feature information.

Projects	Theoretical value (mm)	Measured value (mm)	Error (mm)	Percentage of error (%)
Section side length 1	1,500/2,000	1,496/1,996	4/4	0.27/0.20
Section side length 2	1,340/1,880	1,348/1,883	8/3	0.59/0.16
Section side length 3	1,500/2,000	1,493/1,989	7/11	0.47/0.55
Section side length 4	1,340/1,880	1,340/1,881	0/1	0/0.05
Rod length
a	12,000	12,000.6	0.6	0.005
b	12,000	12,009.4	0.6	0.005
c	12,000	12,001.0	1.0	0.008
d	12,000	12,000.0	0	0