Unknown (Terrain Type)
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| 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. |