Reference
Cost-factor tables
The full COMET reference values for every factor.
The COMET reference values used by the Populate according to COMET buttons. All values are editable in the plugin — use these defaults, or substitute your own for a different region.
Land use — Flu
| Category | Value |
|---|---|
| Unpopulated areas | 1.0 |
| Cultivated land | 1.1 |
| Arid areas | 1.1 |
| Regularly flooded areas | 1.2 |
| Forest | 1.3 |
| Urban areas | 1.8 |
| Water bodies | 4.0 |
| Protected areas | 10 † |
† COMET defines a protected-areas category (cost 10), but Portugal’s COSc map doesn’t identify protected areas — so it is not auto-filled by Populate according to COMET. See COSc to COMET mapping.
Slope — Fs
| Slope | Value |
|---|---|
| < 10% | 1.0 |
| 10–20% | 1.1 |
| 20–30% | 1.2 |
| 30–70% | 3.0 |
| > 70% | 9.0 |
Crossing — Fci
| Situation | Value |
|---|---|
| No crossing | 1.0 |
| Road or railway | 3.0 |
Existing corridor — Fc
| Situation | Value |
|---|---|
| Onshore, existing corridor | 0.9 |
| Onshore, new corridor | 1.0 |
| Offshore, existing corridor | 2.7 |
| Offshore, new corridor | 3.0 |
COSc to COMET mapping
The Populate according to COMET button in the Land Use tab is built for Portugal’s COSc map — the Carta de Ocupação do Solo Conjuntural (DGT land-cover cartography). It recognises the detailed COSc Level 3 (Nível 3) thematic classes — the class codes defined in the COSc nomenclature — and fills each one with its COMET cost automatically.
If your layer uses a different land-cover classification (a different country, or another COSc level), the automatic mapping won’t match — just enter the costs by hand. The button only knows these COSc Level 3 class IDs:
| COSc class (ID) | COMET category | Flu |
|---|---|---|
| Artificialised (100) | Urban | 1.8 |
| Cultivated (211, 212, 213) | Cultivated | 1.1 |
| Forest — cork oak, eucalyptus, pines… (311–323) | Forest | 1.3 |
| Scrub, herbaceous (410, 420) | Arid | 1.1 |
| Unpopulated (500) | Unpopulated | 1.0 |
| Wetlands (610) | Regularly flooded | 1.2 |
| Water (620) | Water bodies | 4.0 |
One gap to note: COMET also defines a protected-areas category (cost 10), but COSc doesn’t identify protected areas, so that category can’t be auto-mapped from COSc data — set it manually where it applies.
See the COMET cost model for the full formula.