---
title: ARPlaneAnchor.Classification.Status.unknown
framework: arkit
role: symbol
role_heading: Case
path: arkit/arplaneanchor/classification-swift.enum/status/unknown
---

# ARPlaneAnchor.Classification.Status.unknown

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

## Declaration

```swift
case unknown
```

## Discussion

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 is ARPlaneAnchor.Classification.none(_:) with an associated value of ARPlaneAnchor.Classification.Status.unknown.

## See Also

### Classification Status

- [ARPlaneAnchor.Classification.Status.notAvailable](arkit/arplaneanchor/classification-swift.enum/status/notavailable.md)
- [ARPlaneAnchor.Classification.Status.undetermined](arkit/arplaneanchor/classification-swift.enum/status/undetermined.md)