TLS-Based Feature Extraction and 3D Modeling for Arch Structures

Table 4

Improvement analysis.

Ratio (%)	Epoch	X	Y	Z
Improvement by B-spline approximation
Whole curve	E3	92.42	91.98	91.72
	E9	89.49	89.34	89.21
Segmentation	E3	77.07	71.25	66.24
	E9	72.22	67.87	60.52
Improvement by segmentation
P methods	E3	89.60	86.23	88.58
	E9	85.45	80.46	86.13
B methods	E3	68.51	50.66	53.43
	E9	61.54	41.10	49.24