has part is about one-dimensional spatial region x-axis cartesian coordinate system one dimensional cartesian coordinate system Philippe Rocca-Serra Alejandra Gonzalez-Beltran A one dimensional cartesian coordinate system is a cartesian coordinate system which defines a one dimensional axis and which may be used to describe a one dimensional spatial region, i.e. a straight line. It is defined by a point O, the origin, a unit of length and the orientation for the one dimensional space. Orlaith Burke one dimensional cartesian spatial coordinate origin ready for release