What is (X, Y) value in Kinect's Skeleton Joint.Position. (X,Y, Z)?
<p>I tried this</p>

<pre><code>Joint rightHand = skeleton.Joints[JointType.HandRight];

double rightX = rightHand.Position.X;
double rightY = rightHand.Position.Y;
double rightZ = rightHand.Position.Z;
</code></pre>

<p>then I got this :</p>

<pre><code>rightX : 0,04908288
rightY : -0,0657815
rightZ : 1,776147
</code></pre>

<p><a href="http://i.stack.imgur.com/jEvIF.png" rel="nofollow">enter image description here</a></p>

<p>Can anyone explain to me, what is X and Y value?
I heard that the range of that value will be from -1 to 1.
Is the value of 'rightHand.Position.Z' same as the Z-axis value of the Object? Or it represents the object's distance from the center of the 3D coordinate system (0,0,0) which is I may say Z'? Because when I move my head up and down 'rightHand.Position.Z' value increases higher. However, it decreases when I move my head horizontally with XZ plane. </p>

<p>Due to I need to obtain the angle between the line Z' and the XZ plane (the angle between Z' and its orthogonal projection onto XZ), I want somebody to explain what is X and Y?</p>

<p>PS: XZ plane is the plane between X-axis and Z-axis.</p>