DETECTION AND QUANTIFICATION OF MATERIAL DISPLACEMENTS AT HISTORICAL STRUCTURES USING PHOTOGRAMMETRY AND LASER SCANNING TECHNIQUES

This study proposes a new non-contact approach allows detecting, measuring and tracking the change of cracks in the historical structure using photogrammetric techniques and computer methods. The proposed procedure used an accurate generation of true orthophoto of the studied structure using precise 3D surface representations derived from laser scanning and several digital images that entirely cover the object of interest. Cracks are extracted from the generated orthophoto using a series of image processing techniques. The developed algorithm is applied to analyze and monitor the structural damage in Amra Palace, a UNESCO world heritage site, in Jordan desert.