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In this paper we present a methodology to accurately derive 3D photo models of a World Heritage monument by means of terrestrial laser scanning (TLS) and close range photogrammetry. TLS will provide 3D point clouds as well as rough photo models that can substantially be improved draping texture with external imagery. The tomb Djin Block No. 9 in Petra is used to compare texture results delivered by the camera of the terrestrial laser scanner versus an external off-the-shelf digital camera. The issue of image resection and calibration of non-metric single imagery is tackled making use of a digital surface model. The presented approach is suitable for off-the-self digital cameras and can cope with single images without overlap. Results show that it is possible, on the one hand, to enhance photo models draping external imagery onto the 3D model, and on the other, to take advantage of single non-metric images to record cultural heritage.
Date of Conference: 9-12 Sept. 2009