Find the depth of head from the kinect sensor

Hi,
I'm trying to get the actual depth of head from the Kinect sensor positioned at 82 inches from the floor and tilted to 40 deg angle.  I used Skeleton Joints head point and right angled triangle trigonometry but unable to get the accurate measurement.
 I considered Joint[JointType.Head].Position.Z as distance but when manually measured the value is not accurate, why it is different from the manual measurement.
Any help would be appreciated!
Mani

Body tracking provide estimates based on body tracking algorithms. These take into account the some offset into the head to represent but based on angles and noise and tracking state of the joint you may need to average it out. Also, you can take the point
as a starting point and then analyze the actual depth data and calculate your own if you need better accuracy.
Carmine Sirignano - MSFT

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