Table 7.

Accuracy evaluation of estimation model for herbs aboveground biomass in the study area.

Model	Expression	Modeling			Verification			P
		R2	RMSE	MAE	R2	RMSE	MAE
Quadratic term	$Y=-33287{\mathrm{R}\mathrm{V}\mathrm{I}}^2+5455.5\mathrm{R}\mathrm{V}\mathrm{I}-198.02$	0.560	0.832	0.689	0.394	0.826	0.642	0.000
MSR	$Y=323.65\mathrm{N}\mathrm{D}\mathrm{V}\mathrm{I}-167.376$	0.542	10.525	6.577	0.637	5.810	4.125	0.000
PLSR	$\begin{array}{l}Y=-2281832.994\mathrm{N}\mathrm{D}\mathrm{V}\mathrm{I}+2285265.977\mathrm{S}\mathrm{A}\mathrm{V}\mathrm{I}-\\ 11772.656\mathrm{R}\mathrm{V}\mathrm{I}+10756.369B_{354}-302.516\mathrm{D}\mathrm{V}\mathrm{I}+4400.234{\mathrm{B}}_{2534}-3794.417\mathrm{E}\mathrm{V}\mathrm{I}-5623.736-3966.025\mathrm{E}\mathrm{V}\mathrm{I}-4253.029\end{array}$	0.648	9.233	5.783	0.721	6.198	4.910	0.000