Where is the origin of the sensor coordinate system?
<p>The documentation shows the orientation of the Axes:
<a href="http://developer.android.com/reference/android/hardware/SensorEvent.html" rel="nofollow">http://developer.android.com/reference/android/hardware/SensorEvent.html</a></p>

<p>But it doesn't specify where exactly the origin is located. Is it in the lower left corner or in the middle of the screen?</p>

<p>The same question also applies to getRotationMatrix:
http://developer.android.com/reference/android/hardware/SensorManager.html#getRotationMatrix(float[], float[], float[], float[])</p>

<p>Since it is a rotation matrix it is implied that the worlds coordinate system has the origin at the same location.</p>
