Abstract
Abstract. Nowadays, researchers widely employ the acquisition of point clouds as one of the principal type of documentation for cultural heritage. In this paper, different digital survey techniques are employed to document a wooden ancient shipwreck, a particular and difficult kind of archaeological finding due to its material characteristics. The instability of wood and the high costs of restoration do not always offer the opportunity of recovering and showing the hull to researchers and public and three-dimensional surveys are fundamental to document the original conditions of the wood. The precarious conditions of this material in contact with air could modify the structure and the size of the boat, requiring a fast and accurate recording technique. The collaboration between Ca' Foscari University and the Laboratory of Photogrammetry of Iuav University of Venice has given the possibility to demonstrate the utility of these technology. We have surveyed a sewn boat of Roman age through multi-image photogrammetry and laser scanner. Point clouds were compared and a residual analysis was done, to verify the characteristics and the opportunity of the two techniques, both of them have allowed obtaining a very precise documentation from a metrical point of view.
Highlights
New sensors, methodologies and multi-resolution 3D representation are improving the reality-based techniques existent, permitting the growth of documentation, research and studies in cultural heritage (Remondino et al, 2010)
Structure from Motion (SfM) photogrammetric technology has inevitably created great interest amongst the archaeological community because it allows the use of consumer grade digital cameras and highly automated data processing (Canciani et al, 2003; McCarthy, 2014; Remondino et al, 2012)
The use of points clouds to record cultural heritage is known in recent years to document sites and findings (De Reu et al, 2013; Remondino et al, 2010)
Summary
Methodologies and multi-resolution 3D representation are improving the reality-based techniques existent, permitting the growth of documentation, research and studies in cultural heritage (Remondino et al, 2010). SfM photogrammetry offers the possibility of fast, automated and low-cost acquisition of 3-D data, which represents a very accurate documentation, from a metrical point of view. The use of points clouds to record cultural heritage is known in recent years to document sites and findings (De Reu et al, 2013; Remondino et al, 2010). The last one, compared to the first, which is very fast, does not require expensive equipment, but only a simple camera. The comparison of these results wants to verify the characteristics and the opportunities of each one. The high detailed digital three-dimensional model give us the possibility to carefully study the characteristics of the construction of the ancient ships, after re-covering the boat, and to reconstruct its original shape, straightening and rebuilding
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