Table 2.
RMSE values (ppb) from cross-validation: comparison for different interpolation techniques for O3 means, 2007-2008 vegetation seasons.
| Seasonal O3 mean (ppb) | ||||
| 2007 | 2008 | Average | ||
|
| ||||
| 40.15 | 38.87 | 39.51 | ||
|
| ||||
| Interpolation technique | RMSE (ppb) | |||
| 2007 | 2008 | Average | Ranking | |
|
| ||||
| IDW | 5.23 | 4.97 | 5.10 | 11 |
| RBF | 4.92 | 4.69 | 4.80 | 10 |
| OK | 4.73 | 4.67 | 4.70 | 9 |
| LR | 3.45 | 3.30 | 3.38 | 5 |
| LR + res_IDW | 3.49 | 3.48 | 3.48 | 8 |
| LR + res_RBF | 3.40 | 3.37 | 3.38 | 6 |
| LR + res_OK | 3.31 | 3.15 | 3.23 | 1 |
| ALR | 3.43 | 3.38 | 3.40 | 7 |
| ALR + res_IDW | 3.44 | 3.22 | 3.33 | 4 |
| ALR + res_RBF | 3.41 | 3.15 | 3.28 | 3 |
| ALR + res_OK | 3.39 | 3.07 | 3.23 | 1 |