Table 3. Comparison of drift effects.

Scanner	Target Distance	Mean Value	Relative Error
	(mm)	${\stackrel{-}{\mathit{x}}}_{\mathit{M}}$(mm)	${\stackrel{-}{\mathit{\eta }}}_{\mathit{M}}$ (%)
URG-04LX [19]	1500	1475	-1.6
URG-04LX [22]	3600	3625	0.7
UTM-30LX [28]	1000	1002	0.2
UTM-30LX [29]	2000	2030	1.5
UTM-30LX [30]	2000	2012	0.6