Assessing tree dendrometrics in young regenerating plantations using terrestrial laser scanning

Table 4 Results of generalized linear models (GLM) for the comparison of data on four tree structural parameters derived from direct field measurements and terrestrial laser scanning (TLS) measurements (given as estimates, i.e., the percentage of the variance explained)

		Tree structural parameter
		H	GD	Llong	Hlong
Estimate (the explained variance)	GDN	0.01**(1.9 %)	n.s.	n.s.	n.s.
	GDP	0.02***(4.3 %)	n.s.	n.s.	n.s.
	IT	n.d.***(16.8 %)	n.s.	n.s.	n.s.
	PCQ	n.d.	n.s.	n.d.	n.d.
	H	n.s.	0.03*(3.13 %)	n.s.	n.s.
	NB	n.s.	n.s.	n.s.	n.s.
	Species	n.d.***(7.2 %)	n.s.	n.s.	n.s.

Tree structural parameters: H total tree height, GD stem diameter at ground height, Llong length of the longest branch, Hlong height of the longest branch, the continuous predictors include GDN sum of the focal tree’s neighboring GDs, GDP sum of all GDs within a plot, H total tree height of the focal tree, NB the number of branches of the focal tree, the categorical predictors include IT inventory team, PCQ GD point cloud quality, Species species identity, n.s. statistically not significant, n.d. not determined
***Pr < 0.001; **0.001 ≤ Pr < 0.01; *0.01 ≤ Pr < 0.05

ISSN: 1297-966X