Table 2. GAM Model selection results for each model date.
| No. | Model Date* | The composite date of environmental variables in the best-fitting models | AIC | Adjusted R2 | ||
| LST | ETa | NDVI | ||||
| 1 | April 22 | April 22 | April 22 | April 22 | 549.7 | 17.7 |
| 2 | April 30 | April 30 | April 30 | April 22 | 522.2 | 29.6 |
| 3 | May 8 | May 8 | April 30 | May 8 | 488.2 | 37.8 |
| 4 | May 16 | May 16 | April 30 | April 22 | 453.1 | 44.6 |
| 5 | May 24 | May 16 | May 24 | April 22 | 438.3 | 39.7 |
| 6 | June 1 | May 16 | June 1 | April 22 | 432.3 | 40.8 |
| 7 | June 9 | May 16 | June 9 | April 22 | 426.2 | 41.9 |
| 8 | June 17 | May 16 | June 17 | April 22 | 410.1 | 44.2 |
| 9 | June 25 | May 16 | June 25 | April 22 | 391.7 | 46 |
| 10 | July 3 | May 16 | July 3 | April 22 | 375.1 | 48 |
| 11 | July 11 | May 16 | July 11 | April 22 | 348.1 | 51.6 |
| 12 | July 19 | July 19 | July 11 | May 8 | 323.6 | 58.7 |
| 13 | July 27 | July 27 | July 11 | May 8 | 303.3 | 60.5 |
| 14 | August 4 | August 4 | July 11 | May 8 | 280.4 | 62.5 |
| 15 | August 12 | August 4 | July 11 | May 8 | 280.4 | 62.5 |
*
Each model was fitted using environmental variables between the earliest composite date (April 22) and the model date.