The following transformations can be made:
- spectral coefficients to spectral coefficients
- spectral coefficients to rotated spectral coefficients
- spectral coefficients to regular latitude-longitude grids
- spectral coefficients to regular gaussian grids
- spectral coefficients to quasi-regular gaussian grids
- regular latitude-longitude grids to regular latitude-longitude grids
- regular latitude-longitude grids to regular gaussian grids
- regular gaussian grids to regular gaussian grids
- regular gaussian grids to regular latitude-longitude grids
- quasi-regular gaussian grids to regular latitude-longitude grids
- quasi-regular gaussian grids to regular gaussian grids
Spectral fields are automatically truncated before interpolation to grid fields to reduce data volumes and spurious 'aliased' values. Default truncations are detailed in the table below:
| Grid increment | Truncation |
|---|
| 2.5 and greater | T63 |
| 1.5 to 2.5 | T106 |
| 0.6 to 1.5 | T213 |
| 0.4 to 0.6 | T319 |
| 0.3 to 0.4 | T511 |
| 0.15 to 0.3 | T799 |
| 0 to 0.15 | T1023 |
The truncation can be controlled using the truncation option in INTIN.