Axes can be either Cartesian, cylindrical or spherical. The coordinates in these are:
An axis is defined by three vectors irrespective of axis type. These
define the location and basic orientation. The
The basic axis system is the Global Cartesian axis system, normally referred to as the Global axis system. All other axis systems are located relative to the Global axis system. Global axis directions are generally denoted X, Y and Z to distinguish from other, more general axis directions which use x, y and z.
All the axes systems in GSA are right handed axes systems. Rotations about the axes follow the right hand screw rule