Table 5.
Covariance (cm6/cm6) and correlation values between errors of each pair of soil moisture products in triplet 1 and 2 (i.e., the Cov(εi, εj) and R2 values of Eq. 2), and covariance values between in-situ soil moisture measurements and errors of soil moisture products (i.e., the Cov(t, εi) and Cov(t, εj) values of Eq. 2).
| Pairs (i, j) | Cov(t, εi) | Cov(t, εj) | Cov(εi, εj) | R2 | |
|---|---|---|---|---|---|
| Triplet 1 | SMOS, FY3-B | 2.87*10−04 | −2.48*10−05 | 4.88*10−04 | 0.005 |
| SMOS, ASCAT | 2.87*10−04 | −2.77*10−07 | 2.66*10−03 | 0.139 | |
| FY3-B, ASCAT | −2.48*10−05 | −2.77*10−07 | 1.74*10−03 | 0.081 | |
| Triplet 2 | 1st merged SSM, ESA-CCI | −7.46*10−08 | 8.37*10−08 | 8.46*10−04 | 0.014 |
| 1st merged SSM, SMAP | −7.46*10−08 | 1.71*10−07 | 2.15*10−03 | 0.054 | |
| ESA-CCI, SMAP | 8.37*10−08 | 1.71*10−07 | 3.52*10−03 | 0.215 |