. Author manuscript; available in PMC: 2022 Sep 7.

Published in final edited form as: Environ Model Softw. 2020 Mar 10;127:104666. doi: 10.1016/j.envsoft.2020.104666

Table 3. Goodness-of-fit statistics and processing time for the reference vs. LAI-reconstructed map as produced by the gap-filling methods for 17,218 pixels.

Methods	RMSE	RRMSE [%]	R²	Time
Methods	RMSE	RRMSE [%]	R²	Total (min)	Per pixel (sec)
ARES	0.500	19.387	0.041	25.533	0.089
BAGTREE	0.482	18.661	0.572	263.050	0.917
GPR	0.153	5.940	0.913	23.100	0.081
KNRR	0.522	20.216	0.137	6.883	0.024
KRR	0.187	7.230	0.826	5.450	0.019
NN	0.248	9.628	0.696	771.824	2.689
RF1	0.341	13.199	0.836	34.049	0.119
RF2	0.539	20.872	0.684	58.397	0.204
Sigmoid	0.187	7.250	0.925	313.117	1.091
Fourier1	0.360	13.961	0.338	0.383	0.001
Fourier2	0.351	13.597	0.380	0.413	0.001
Fourier3	0.350	13.549	0.389	0.226	0.001
Next	0.539	20.872	0.684	0.317	0.001
Polyfit	0.492	19.056	0.002	0.467	0.002
Previous	0.472	18.283	0.849	0.333	0.001
Spline	0.158	6.121	0.896	0.333	0.001