Unknown (Terrain Type)
| Terrain type | Dutch name | Layer | Description |
|---|---|---|---|
| Unknown | Onbekend | Underground | This is the default underground Terrain Type when no subsurface data is available. |
| Terrain type | Dutch name | Layer | Description |
|---|---|---|---|
| Unknown | Onbekend | Underground | This is the default underground Terrain Type when no subsurface data is available. |