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# ARPlaneAnchor.Classification.Status.unknown

ARKit has completed its classification process for the plane anchor, but the result is inconclusive.

```
case unknown
```

## Discussion

ARKit attempts to classify detected planes using a finite set of common categories. However, a detected plane may not be a real object fitting any of those categories, or the plane classification process may not be able to recognize it. In such cases, the plane anchor’s [`classification`](/documentation/ARKit/ARPlaneAnchor/classification-2hi2p) is [`ARPlaneAnchor.Classification.none(_:)`](/documentation/ARKit/ARPlaneAnchor/Classification-swift.enum/none(_:)) with an associated value of [`ARPlaneAnchor.Classification.Status.unknown`](/documentation/ARKit/ARPlaneAnchor/Classification-swift.enum/Status/unknown).

---

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