Table 7: Root mean square errors associated with soil moisture retrieval from the PALS LVV, SVV, and LHH band combination. The errors generally increase with vegetation water content [41].

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

178, 1891 dry, 1 wet0.04010.03400.04770.04470.0490
176, 186, 1891 dry, 2 wet0.03730.02860.05760.05510.0501
178, 188, 1891 dry, 2 wet0.03950.02930.05020.04390.0481
176, 178, 1892 dry, 1 wet0.03980.03190.04930.04430.0490
176, 178, 1872 dry, 1 wet0.03820.03400.04650.04500.0987
188, 1892 wet0.05710.17470.04430.0481
176, 1782 dry0.04210.05980.0497