Recording the physical characteristics of historic structures and landscapes is a cornerstone of preventive maintenance, monitoring and conservation. The information produced by such work guides decision-making by architects, property owners, site managers, public officials, and conservators. Rigorous documentation may also serve a broader purpose: over time, it becomes the primary means by which scholars and the public apprehend a site that has since changed radically or disappeared. Led by experts in the field, decide which techniques are best suited to which sites and objectives. this session introduces the use of 3D Scanning and digital Photogrammetry for the appropriate surveying of these buildings.