uvz definitions #9
Description
In the meeting in Lisboa we had some issues with the correct definition of the uvz orientation of a variometer mentioned in different older formats.
After discussion with Alex Gonsette and indirectly Jean Rasson. They explained that uvz is indeed a rotation in the horizontal plane.of the xyz component (being x true north and y true east). When defining these rotation in mathematics we often use uvw as a result of a complete rotation of xyz axes system. Naturally when rotating a system the angles become important. So Jean Rasson confirmed that it is a rotation of 45° in the horizontal plane. If we the use the definitions given by Chris here
We can safely replace the uvz by ABZ. We just have to adapt the TM to that and include these AB definitions into the TM.
When I look at the complete table given by Chris I notice the first part XYZHDIF being the magnetic components as defined in the faq and TM.
But then we have SGEVAB which are more linked to the orientation of the instruments and the instruments to measure the magnetic components.
These are for the moment only mentioned in different parts but not really defined in an overview table.