Table 5: Root mean square errors associated with soil moisture retrieval from the PALS LH channel by the statistical regression technique. Note that the retrieval errors are greatest for the VWC > 4.5 kg/m2 class [41].

Calibration daysNoteVWC < 1.01 < VWC < 2.52.5 < VWC < 3.53.5 < VWC < 4.5 VWC > 4.5

178, 1891 dry, 1 wet0.03710.03260.05790.04170.0623
176, 186, 1881 dry, 2 wet0.03710.03020.05780.04090.0738
178, 188, 1891 dry, 2 wet0.03740.03220.04920.04100.0643
176, 178, 1892 dry, 1 wet0.03750.02710.06090.04170.0623
176, 178, 1872 dry, 1 wet0.03830.03280.05310.04500.0635
188, 1892 wet0.04030.03370.04020.0643
176, 1782 dry0.14590.12280.0774