Table 4.

Comparisons of the different ET estimation methods with UAVs.

Methods	Applications with UAVs	Accuracy of ${\mathit{R}}_{\mathit{n}}$	Accuracy of G	Accuracy of $\mathbf{LE}$	Accuracy of H
OSEB TSEB	Grassland [40]	$R^2$ of 0.98 $R^2$ of 0.99	$R^2$ of 0.73 $R^2$ of 0.83	$R^2$ of 0.92 $R^2$ of 0.93	$R^2$ of 0.79 $R^2$ of 0.84
TSEB DTD	Barley [21]	RMSE of 44 W m${}^{-2}$ RMSE of 44 W m${}^{-2}$	RSME of 38 W m${}^{-2}$ RSME of 48 W m${}^{-2}$	RMSE of 94 W m${}^{-2}$ RSME of 67 W m${}^{-2}$	RMSE of 85 W m${}^{-2}$ RSME of 59 W m${}^{-2}$
TSEB DATTUTDUT	Vineyard [35]	RMSE of 33 W m${}^{-2}$ RMSE of 66 W m${}^{-2}$	RSME of 33 W m${}^{-2}$ RSME of 40 W m${}^{-2}$	RMSE of 87 W m${}^{-2}$ RSME of 150 W m${}^{-2}$	RMSE of 42 W m${}^{-2}$ RSME of 68 W m${}^{-2}$
TSEB	Olive [31]	RMSE of 38 W m${}^{-2}$	RMSE of 19 W m${}^{-2}$	RMSE of 50 W m${}^{-2}$	RMSE of 56 W m${}^{-2}$
SEBAL	Corn, soybean [32]	$R^2$ of 0.71	$R^2$ of 0.17 and 0.22	$R^2$ of 0.82	$R^2$ of 0.5