A dimension of space, such as width, height, or length.

• can be zero-dimensional (location point),
• one-dimensional (e.g. line, curve, path),
• two-dimensional (e.g. surface, face), or
• three-dimensional (e.g. surface, face) (e.g. body, volume).

EXAMPLE

In a 3D environment, the dimensionality of a pipe can be

• 1D to extract pipe lengths for quantity take off purposes
• 3D for clash detection purposes
• 2D in a 3D environment for parcel management.
• 2D for furniture planning
• 3D for accessibility analysis.