The Use of Historical Photography For Mapping Archaeological Sites

Abstract

Aerial photography has been employed by archaeologists since 1906. This study discusses the application of image processing of historical photographs as an aid to archaeological excavations at two California mission sites.

Research on the Mission Vieja de la Purisima site involved the mapping of the Old Mission complex, destroyed by an earthquake and mudslide in 1812. Optical means of multiple-image registration and scale change were employed. The second study involved the digital transformation of an historical photograph of Mission San Buenaventura from its oblique perspective into a “psuedo-vertical” format.

Information obtained in these studies is being used by archaeological researchers and has been found accurate and extremely useful. The preliminary mapping of the Mission Vieja de la Purisima has aided in the preservation of the area and played a major role in the mission's being designated as a California and National Historical site.