The spatial variability of actual evapotranspiration across the Amazon River Basin based on remote sensing products validated with flux towers

Ecological Processes

Table 5 Impact of footprint 250 m × 250 m (6.25 ha) vs. 1750 m × 1750 m (306.25 ha) of flux towers on the performance of ET-Amazon for monthly time steps

Direct measurement
250 m × 250 m	K34	K67	BAN
RMSE	26.76	21.66	16.75
R²	0.48	0.84	0.55
1750 m × 1750 m	K34	K67	BAN
RMSE	27.87	20.83	17.84
R²	0.5	0.87	0.36
Residual energy balance closure
250 m × 250 m	K34	K67	BAN
RMSE	14.89	22.02	24.71
R²	0.54	0.83	0.29
1750 m × 1750 m	K34	K67	BAN
RMSE	13.98	27.47	23.62
R²	0.64	0.86	0.22
Bowen ratio energy balance closure
250 m × 250 m	K34	K67	BAN
RMSE	16.92	59.80	20.13
R²	0.54	0.30	0.51
1750 m × 1750 m	K34	K67	BAN
RMSE	16.80	61.45	19.58
R²	0.62	0.36	0.34