- From: Steve Block <steveblock@google.com>
- Date: Mon, 25 Jun 2012 13:24:56 +0100
- To: Rich Tibbett <richt@opera.com>
- Cc: public-geolocation@w3.org
Hi Rich, > The starting question here is: what is the correct, normative device > orientation calibration to use in the three reference planes provided below? When you say 'calibration', I believe you're referring to the definition of the body frame xyz and the angles alpha, beta and gamma, not the calibration event in the spec. Is that right? > IIUC the specification does not yet provide enough information to answer > this question I think it does. The spec defines alpha, beta and gama in terms of the transformation from a coordinate frame fixed on the Earth to a coordinate frame fixed in the device. If you see any specific problems with the definition, please let me know. > [A1] > http://people.opera.com/richt/release/tests/orientation/calibration/alpha_A1.jpg > (pointing due north) You need to be more precise than 'pointing'. Which vector in the body frame is pointing north? > To start, we must rotate the device 90 degrees clockwise as it sits on a table. Why is this? If you'd like to add specific examples to the non-normative section of the spec, I'm happy to help with that. Steve
Received on Monday, 25 June 2012 12:25:30 UTC