Origins of Coordinate Axes

By default, all spatial coordinates on isometrics are given in the World coordinate system. The AXES command allows the user to specify a different coordinate system for the isometric. The user can use the origin of any database element which has an origin.

Each owning element (Site, Zone) in a design project has its own coordinate system for locating the elements it owns. The coordinates of an element are usually defined with respect to its owner, and these coordinates are not normally the same as World coordinates.

Coordinate systems within a design project

With reference to the Coordinate systems within a design project image, the E/W and N/S coordinates of the piping component are:

The Coordinate systems within a design project image illustrates this in two dimensions, but the same principle applies to the elevation axis.

Spatial coordinates are shown on the drawing, by default, at all pipe termination or connection points. The user can control when coordinates are plotted by using the COORDINATES command. The user can choose to switch off coordinates of end points which are connected to Nozzles, continued on other Pipes or which have connection type Open, Clos, Vent or Dran.