# Coordinate systems

All plot specifications requires a coordinate system. By default, rectangular (Cartesian) coordinates are used. This can be changed to polar coordinates by using .gg.coords.polar (see .qp.s.coord).

## .gg.coords.cube

3D coordinate system

3D points are plotted via orthographic projection onto a 2D plane, which is tangential to a point on the unit sphere defined by 2 angles, the azimuth, and the altitude.

The azimuth is the angle between the point and the X axis along the X-Y plane. The altitude is the angle between the point and the X-Y plane. For more about azimuth/altitude, see: https://en.wikipedia.org/wiki/Azimuth

Parameters:

Name Type Description
azimuth float
altitude float