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# AVDepthData.Accuracy

Values indicating the general accuracy of a depth data map.

```
enum Accuracy
```

## Overview

The accuracy of a depth data map is highly dependent on the camera calibration data used to generate it. If the camera’s focal length cannot be precisely determined at the time of capture, a scaling error in the z (depth) plane is introduced. If the camera’s optical center can’t be precisely determined at capture time, a principal point error is introduced, leading to an offset error in the disparity estimate.

These values report the accuracy of a map’s values with respect to its reported units.

## Topics

### Accuracy values

[`AVDepthData.Accuracy.relative`](/documentation/AVFoundation/AVDepthData/Accuracy/relative)

Values within the depth data map are usable for foreground/background separation, but are not absolutely accurate in the physical world.

[`AVDepthData.Accuracy.absolute`](/documentation/AVFoundation/AVDepthData/Accuracy/absolute)

Values within the depth map are absolutely accurate within the physical world.


---

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