Change Detection and Feature Extraction of Debris-Flow Initiation by Rock-Slope Failure Using Point Cloud Processing

Table 1

z value difference comparison in areas of data overlap.

Year flown	Range of z difference (m)	Error range (m)	Overall error range (m)
2005	−0.51 to 0.41	0 ± 0.28	±0.30
2007	−0.51to 0.45	0 ± 0.27
2011	−0.51 to 0.53	0 ± 0.26
2015	−0.64 to 0.65	0 ± 0.27