Ichnography
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Ichnography (Gr. ιχνος, a trace, and γραφος, description), in architecture, a term defined by Vitruvius (i.2) as the ground-plan of the work, i.e. the geometrical projection or horizontal section representing the plan of any building, taken at such a level as to show the outer walls, with the doorways, windows, fireplaces, etc., and the correct thickness of the walls; the position of piers, columns or pilasters, courtyards and other features which constitute the design.
This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.