| MODEL | INNER CHECK-POINTS | OUTER CHECK-POINTS | ||
| Average (m) | St. Dev. (m) | Average (m) | St. Dev. (m) | |
| (1) | −0.006 | 0.021 | −0.016 | 0.144 |
| (2) | −0.012 | 0.027 | −0.101 | 0.249 |
| (3) | −0.015 | 0.032 | −0.391 | 0.225 |
| (4) | −0.017 | 0.030 | −0.482 | 0.354 |
| (5) | −0.002 | 0.007 | −0.013 | 0.045 |
| Kriging | 0.026 | 0.026 | 0.083 | 0.084 |
| IDW | 0.031 | 0.032 | 0.119 | 0.178 |
| RBF | 0.019 | 0.017 | 0.081 | 0.086 |