---
title: VNTrajectoryObservation
framework: vision
role: symbol
role_heading: Class
path: vision/vntrajectoryobservation
---

# VNTrajectoryObservation

An observation that describes a detected trajectory.

## Declaration

```swift
class VNTrajectoryObservation
```

## Mentioned in

Identifying Trajectories in Video

## Topics

### Evaluating an Observation

- [detectedPoints](vision/vntrajectoryobservation/detectedpoints.md)
- [projectedPoints](vision/vntrajectoryobservation/projectedpoints.md)
- [equationCoefficients](vision/vntrajectoryobservation/equationcoefficients.md)
- [movingAverageRadius](vision/vntrajectoryobservation/movingaverageradius.md)

## Relationships

### Inherits From

- [VNObservation](vision/vnobservation.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)
- [VNRequestRevisionProviding](vision/vnrequestrevisionproviding.md)

## See Also

### Inspecting the Results

- [results](vision/vndetecttrajectoriesrequest/results.md)