Table 4.
Scheme to assign the weight values of three SSM products in 1st and 2nd steps (×: soil moisture value of SSM product is not available; О: soil moisture value of SSM product is available).
| Merge Steps | SMOS | FY3-B | ASCAT | Weight values | Result |
|---|---|---|---|---|---|
| Triplet 1 | × | × | × | w1 = w2 = w3 = 0 | 1st merged SSM product |
| О | × | × | w1 = 1, w2 = w3 = 0 | ||
| × | О | × | w2 = 1, w1 = w3 = 0 | ||
| × | × | О | w3 = 1, w1 = w2 = 0 | ||
| О | О | × | w1 and w2 by Eq. 8, w3 = 0 | ||
| × | О | О | w2 and w3 by Eq. 8, w1 = 0 | ||
| О | × | О | w1 and w3 by Eq. 8, w2 = 0 | ||
| О | О | О | w1, w2 and w3 by Eq. 7 | ||
| 1st merged SSM | ESA-CCI | SMAP | Weight values | Result | |
| Triplet 2 | × | × | × | w1 = w2 = w3 = 0 | 2nd merged SSM product |
| О | × | × | w1 = 1, w2 = w3 = 0 | ||
| × | О | × | w2 = 1, w1 = w3 = 0 | ||
| × | × | О | w3 = 1, w1 = w2 = 0 | ||
| О | О | × | w1 and w2 by Eq. 8, w3 = 0 | ||
| × | О | О | w2 and w3 by Eq. 8, w1 = 0 | ||
| О | × | О | w1 and w3 by Eq. 8, w2 = 0 | ||
| О | О | О | w1, w2 andw3 by Eq. 7 |