ARKit must know the height of a person in the camera feed to estimate an accurate world position for the person's body anchor. ARKit uses the value of estimatedScaleFactor to correct the body anchor's position in the physical environment.
The default body is 1.8 meters tall.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.