Remote Sensing of Soil Moisture

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 days	Note	VWC < 1.0	1 < VWC < 2.5	2.5 < VWC < 3.5	3.5 < VWC < 4.5	VWC > 4.5
178, 189	1 dry, 1 wet	0.0371	0.0326	0.0579	0.0417	0.0623
176, 186, 188	1 dry, 2 wet	0.0371	0.0302	0.0578	0.0409	0.0738
178, 188, 189	1 dry, 2 wet	0.0374	0.0322	0.0492	0.0410	0.0643
176, 178, 189	2 dry, 1 wet	0.0375	0.0271	0.0609	0.0417	0.0623
176, 178, 187	2 dry, 1 wet	0.0383	0.0328	0.0531	0.0450	0.0635
188, 189	2 wet	0.0403	0.0337	—	0.0402	0.0643
176, 178	2 dry	0.1459	0.1228	0.0774	—	—