---
title: verticalAccuracy
framework: corelocation
role: symbol
role_heading: Instance Property
path: corelocation/cllocation/verticalaccuracy
---

# verticalAccuracy

The validity of the altitude values, and their estimated uncertainty, measured in meters.

## Declaration

```swift
var verticalAccuracy: CLLocationAccuracy { get }
```

## Discussion

Discussion A positive verticalAccuracy value represents the estimated uncertainty associated with altitude and ellipsoidalAltitude. This value is available whenever altitude values are available. If verticalAccuracy is 0 or a negative number, altitude and ellipsoidalAltitude values are invalid. If verticalAccuracy is a postive number, altitude and ellipsoidalAltitude values are valid. A positive verticalAccuracy value represents an uncertainty that’s approximately 68 percent, or one standard deviation, above and below the altitude values. note: In iOS, this property is declared as nonatomic. In macOS, it’s declared as atomic.

## See Also

### Getting the location accuracy

- [horizontalAccuracy](corelocation/cllocation/horizontalaccuracy.md)
- [CLLocationAccuracy](corelocation/cllocationaccuracy.md)