Table 1.
Classification methods for weather maps
| Approach | Method | Data sets | Refs. | Comments |
|---|---|---|---|---|
| Classification into regimes by position | ||||
| Cluster analysis | Categorical | NH | 25 | Fuzzy |
| NH + sectorial | 33 | Hard (K − means) | ||
| Hierarchical | NH + sectorial | 26 | 3 NH clusters | |
| PDF estimation | Univariate | NH | 48 and 49 | Bimodality |
| Multivariate | NH | 27 and 31 | 3 modes | |
| NH + sectorial | 28 | Multimodal | ||
| 29 | 3 NH clusters | |||
| Classification into regimes by persistence | ||||
| Pattern correlations | NH | 81 | ||
| SH | 82 | 3 regimes | ||
| Minima of tendencies | Models Atl.–Eur. sector | 6, 34, and 83 35 | 4 regimes | |
| Transition probabilities | ||||
| Counts | Model & NH | 25 | Elementary | |
| Monte Carlo | NH & SH | 54 | Advanced | |
| NH + sectorial | 28 | Advanced | ||