Re: axes and normalization of orientation events

Steve,

As you say, location of the origin is important for location determination and not as obvious for rotation.

In 2D, rotation angles in a plane is equal for every point in the plane - so the origin is irrelevant for rotation in a 2D plane.

Not sure its that simple in 3D.  I have to think/review that case before commenting.

George



On Jun 28, 2011, at 5:42 AM, Steve Block wrote:

> Thanks for the comment George.
> 
>> Its also important to specify the location of the origin of the coordinate
>> reference system (CRS).
> I'm not sure why you think this is important. The DeviceOrientation
> spec makes no mention of position - only orientation and acceleration.
> 
> If your comment instead relates to the Geolocation spec, can you
> provide a concrete usecase where specifying the location of the origin
> in the body would be an advantage?
> 
> Thanks,
> Steve
> 
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George Percivall
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