A hierarchy of photogrammetric records for archaeology and architectural history

Abstract Traditionally, photogrammetry for archaeology has produced 2D elevations and plans. Whilst these constitute a useful record they have limited application and cannot be interrogated further if the information desired is not directly represented. These limitations mean that the information is related to matters of present importance but is inadequate for answering questions which may be raised later and by other researchers. However, the increasing power and diminishing cost of computer-graphics workstations mean that archaeological groups are becoming more able to afford systems capable of full 3D visualisation and manipulation. This paper derives from an archaeological survey of the Tomb of Christ in Jerusalem which was carried out between 1989 and 1993. The survey was instigated with the aim of achieving several archaeological requirements including an accurate stone-by-stone record before reconstruction or restoration and a data structure which would allow the combination adn linking of a variety of data types including archaeological field notes, photogrammetric data and historical maps, plans and drawings. This paper discusses the content of such records and classifies them according to a hierarchy related to levels of objectivity.