![]() ![]() The third coordinate may be called the height or altitude (if the reference plane is considered horizontal), longitudinal position, or axial position. The radius and the azimuth are together called the polar coordinates, as they correspond to a two-dimensional polar coordinate system in the plane through the point, parallel to the reference plane. The distance from the axis may be called the radial distance or radius, while the angular coordinate is sometimes referred to as the angular position or as the azimuth. Other directions perpendicular to the longitudinal axis are called radial lines. ![]() ![]() The axis is variously called the cylindrical or longitudinal axis, to differentiate it from the polar axis, which is the ray that lies in the reference plane, starting at the origin and pointing in the reference direction. This is the intersection between the reference plane and the axis. The origin of the system is the point where all three coordinates can be given as zero. The latter distance is given as a positive or negative number depending on which side of the reference plane faces the point. The dot is the point with radial distance ρ = 4, angular coordinate φ = 130°, and height z = 4.Ī cylindrical coordinate system is a three-dimensional coordinate system that specifies point positions by the distance from a chosen reference axis (axis L in the image opposite), the direction from the axis relative to a chosen reference direction (axis A), and the distance from a chosen reference plane perpendicular to the axis (plane containing the purple section). 3-dimensional coordinate system A cylindrical coordinate system with origin O, polar axis A, and longitudinal axis L. ![]()
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