Table 3 Statistical metrics of the fine-resolution LAI maps of the study areas in Jiaozuo and Zhoukou, Henan Province.

ID	Date	Latitude (°)	Longitude (°)	Crop cover	Mean_LAI_U1	Uncertainty	Standard deviation	Mean_LAI_U2	Scaling difference
5	2003/3/30	33.81258	114.63295	0.86	2.451	0.569	0.952	2.349	0.102
11	2003/3/30	33.74116	114.42932	0.88	2.228	0.517	0.980	2.406	−0.178
14	2003/3/30	33.73983	114.69064	0.96	3.202	0.743	1.214	2.855	0.347
16	2003/3/30	33.71973	114.37526	0.93	3.207	0.744	1.181	3.454	−0.247
2	2004/4/8	35.14029	113.02383	0.93	2.561	0.336	1.770	1.758	0.803
6	2004/4/8	35.11618	112.99328	0.96	2.733	0.358	1.721	2.741	−0.008
8	2004/4/8	34.95611	112.76271	0.83	3.604	0.472	2.053	2.820	0.784
11	2004/4/8	34.93798	112.99126	0.79	3.567	0.467	1.981	2.774	0.793
2	2004/4/24	35.14029	113.02383	0.93	3.168	0.215	1.777	2.455	0.712
6	2004/4/24	35.11807	112.99333	0.95	3.436	0.234	1.571	3.608	−0.172
8	2004/4/24	34.95611	112.76271	0.83	3.746	0.255	1.547	3.267	0.479
11	2004/4/24	34.93798	112.99126	0.79	2.641	0.180	0.951	2.339	0.302
2	2004/5/10	35.14029	113.02383	0.93	3.118	0.243	1.401	2.560	0.558
6	2004/5/10	35.11706	112.98935	0.95	4.310	0.336	1.843	4.154	0.155
7	2004/5/10	34.95611	112.76271	0.83	3.607	0.281	1.331	3.287	0.320
10	2004/5/10	34.93798	112.99126	0.79	2.892	0.226	0.960	2.587	0.305
2	2004/5/17	35.14029	113.02383	0.93	2.347	0.305	1.295	1.776	0.570
6	2004/5/17	35.11837	112.99169	0.95	2.448	0.318	1.123	2.411	0.037
8	2004/5/17	34.95611	112.76271	0.83	2.059	0.268	0.902	1.878	0.181
11	2004/5/17	34.93659	112.99319	0.76	1.615	0.210	0.669	1.426	0.189

The mean LAI is the average LAI within each 3 km × 3 km validation reference map. The uncertainty is the product of the mean LAI and the RRMSE obtained using the NDVI-based inversion model. The scaling difference is the difference between the mean LAI values generated using the two different upscaling methods. The standard deviation represents the spatial heterogeneity of the fine-resolution LAI maps. The IDs correspond to the file names for the reference LAI maps.

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