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# altitude

Vertical distance, in meters, between this anchor and sea level.

```
@nonobjc var altitude: CLLocationDistance? { get }
```

## Discussion

Negative values indicate below sea level. This property is valid only when [`altitudeSource`](/documentation/ARKit/ARGeoAnchor/altitudeSource-swift.property) is a value other than [`ARGeoAnchor.AltitudeSource.unknown`](/documentation/ARKit/ARGeoAnchor/AltitudeSource-swift.enum/unknown).

---

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