Planometric drawing is three dimensional representation that is projected from an accurate plan or top view of a single plane, like a floor plan. It is a drawing system of parallel projections extruded from this plan to create a three dimensional representation of the object. Planometric drawings are used to show that depth exists but to leave the plan view unaltered. All of the parallel projection systems - isometric, axonometric, and planometric - do not distort the scale of all dimensions as is the case in perspectival drawing and perspectives.
Drawings by Frank Gaylard from: Fisher, Roger C. 1992. Visual Lexicon of the South African Dwelling. Cape Town: Unibook. p, 8.