# Changeset 282

Ignore:
Timestamp:
Dec 29, 2012 12:52:14 AM (9 years ago)
Message:

Building out the docs for the specification of the standard. Work still in progress.

Location:
canSAS2012/docs/source
Files:
7 edited

Unmodified
Removed
• ## canSAS2012/docs/source/basics.rst

 r270 =========================== The canSAS standard assumes a right-hand rule coordinate system, consistent with a variety of software packages and data formats. See, for example: http://www.nexusformat.org/Coordinate_Systems The canSAS standard assumes a right-hand rule coordinate system, [#]_, [#]_, [#]_ consistent with a variety of software packages and data formats. [#]_ :z: :math:`z` is along the trajectory of the radiation :math:`z` is along the trajectory of the incident radiation (positive value in the direction towards the detector) :x: :math:`y` is orthogonal to :math:`z` and :math:`x` in the vertical plane (positive values increase upwards) .. [#] http://en.wikipedia.org/wiki/Coordinate_system#Cartesian_coordinate_system .. [#] http://en.wikipedia.org/wiki/Polar_coordinate_system .. [#] http://en.wikipedia.org/wiki/Spherical_coordinate_system .. [#] http://www.nexusformat.org/Coordinate_Systems .. _Coordinate Axes geometry: .. figure:: graphics/translation-orientation-geometry-2.png :alt: Coordinate Axes :height: 400 px definition of the coordinate axes for translations and rotations .. index:: Orientation =========================== Orientation (angles) describes single-axis rotations (rotations about multiple axes require more information): **roll** is a rotation about the :math:`z` axis **pitch** is a rotation about the :math:`x` axis **yaw** is a rotation about the :math:`y` axis ----------- Orientation angles [#]_ in the canSAS standard describe single-axis rotations. Rotations about multiple axes require more information. The rotations are described in terms of roll, pitch, and yaw [#]_ : :**roll**: a rotation about the :math:`z` axis, where zero rotation is along the positive :math:`x` axis :**pitch**: a rotation about the :math:`x` axis, where zero rotation is along the positive :math:`z` axis :**yaw**: a rotation about the :math:`y` axis, where zero rotation is along the positive :math:`z` axis .. [#] http://en.wikipedia.org/wiki/Orientation_%28geometry%29 .. [#] http://en.wikipedia.org/wiki/Tait-Bryan_angles#Aircraft_attitudes