Table 5.

The accuracy of LAI retrieval results using different methods.

Data	Reference	Model	${\rho }_v/{\rho }_g$ calculation strategy	${\rho }_v/{\rho }_g$	Correlation	R2	RMSE
LiDAR waveform and Spectral imagery	\	GORT	Fusion strategy (proposed)	Change value	0.81	0.65	1.01
LiDAR waveform	Tang et al. (2012)	GORT	Set experienced value	2.50	0.63	0.40	2.01
LiDAR waveform	Armston et al. (2013)	GORT	Least squares	1.07	0.53	0.28	2.85
LiDAR waveform and Spectral imagery	Yang et al. (2019)	Gap fraction-based model	Set experienced value	2.00	0.51	0.30	2.76
Spectral imagery	\	NDVI-LAI relationship	\	\	0.48	0.25	2.72

\, indicates that the grid value is empty.