The study about construction drawing surveying and mapping applied in off-site ancient building protection — Longyou city as an example

Ancient building protection conducted in different place was an effective method for the ancient building protection. There were abundant ancient buildings in Longyou city. The ancient building structures in Longyou city were surveyed by using the traditional method. Their level control points were surveyed by using fourth-order leveling. Their distances and angles were surveyed by using ordinary leveling survey. Their wall painting, texture and bedding plane construction technology were surveyed by using close photography. Their brick carving, stone carving and wood carving were surveyed by using 3-D laser scanning. All of these measures realized the ancient buildings protection in different place. A lot of real data were gained by the leveling surveying, control surveying and detail surveying applied to the ancient building in Longyou city. The data were deal with error analysis and the ancient building construction drawings were restored with computer aided design. The project could provide an engineering reference for other ancient building protection which conducted in different place.