[Retracted] 3D Reconstruction and Intelligent Digital Conservation of Ancient Buildings Based on Laser Point Cloud Data

Table 1

Airborne LiDAR system parameter configuration.

Performance parameter	ALS60	ALTM Orion	LMS-Q560
Wavelength (nm)	1060	1060	1500
Beam divergence (mrad)	0.21	0.24	0.29
Record the first and last echo (Y/N)	Y	Y	Y
Scanning method	Rotating polygon mirror	Rotating polygon mirror	Rotating polygon mirror
Pulse frequency (kHz)	20–198	150	40–230
Maximum scanning angle (deg)	75	50	60
Record intensity signal (Y/N)	Y	Y	Y