Using Multispectral Spaceborne Imagery to Assess Mean Tree Height in a Dryland Plantation

Table 2

Comparison between measured and predicted values of mean tree height for twelve CC classes (each class represents an average of two plots) over the validation dataset. Each class contains two cases. Relative and absolute errors were calculated as RE=(|measured−modeled|)/measure and AE=|measured−modeled|, respectively.

CC class	COMP	SITE	Measured height (m)	Modeled height (m)	Relative Error	Absolute  error (m)
<30	8.44	6.35	6.6	7.1	0.07	0.4
30–35	9.43	9.79	10.5	9.9	0.05	0.6
35–40	5.71	6.67	4.4	5.0	0.14	0.6
40–45	9.74	7.25	9.3	8.6	0.08	0.7
45–50	7.37	8.98	7.6	7.7	0.02	0.1
50–55	9.38	10.30	8.8	10.1	0.15	1.3
55–60	10.04	10.55	11.0	10.7	0.02	0.3
60–65	11.04	9.52	11.1	10.9	0.02	0.2
65–70	10.01	9.31	8.9	9.9	0.11	1.0
70–75	7.22	9.17	8.8	7.6	0.13	1.1
75–80	9.32	10.07	10.3	9.8	0.05	0.5
>80	9.96	7.89	8.7	9.0	0.03	0.3
AVG	8.97	8.82	8.8	8.8	0.07	0.59
STD	1.53	1.43	1.9	1.8	0.05	0.39
𝑅^2	0.2		0.86
P value	0.15		<0.01
VIF	1.25