Timber volume estimation based on airborne laser scanning — comparing the use of national forest inventory and forest management inventory data

Table 5 Differences between NFI model predictions and measurements at the FMI sample plots. Values are based on independent validation for NFI data and cross-validation for FMI data. ALS is airborne laser scanning, RMSD is root-mean-squared deviance, and MD is mean deviance

Modeling data	ALS project	RMSD (m³ha^− 1)	RMSD%	MD (m³ha^− 1)	MD%	R²
NFI	ALS project A	83.14	27	30.79	10	0.73
NFI	ALS project B	96.56	25	46.08	12	0.69
NFI	ALS project C	78.38	27	25.24	9	0.83
NFI	total	85.65	27	33.22	10	0.78
NFI & FMI	ALS project A	76.69	25	11.25	4	0.77
NFI & FMI	ALS project B	84.11	22	16.60	4	0.76
NFI & FMI	ALS project C	69.56	24	8.46	3	0.87
NFI & FMI	total	76.43	24	11.78	4	0.82
NFI & top 7 FMI	ALS project A	78.25	26	9.61	3	0.76
NFI & top 7 FMI	ALS project B	86.55	23	27.28	7	0.75
NFI & top 7 FMI	ALS project C	69.70	24	7.11	2	0.87
NFI & top 7 FMI	total	77.78	24	13.90	4	0.81

ISSN: 1297-966X