Abstract
The digitisation of architectural heritage has experienced a great development of low-cost and high-definition data capture technologies, thus enabling the accurate and effective modelling of complex heritage assets. Accordingly, research has identified the best methods to survey historic buildings, but the suitability of Structure-from-Motion/Multi-view-Stereo (SfM/MVS) for interior square symmetrical architectural spaces is unexplored. In contrast to the traditional SfM surveying for which the camera surrounds the object, the photograph collection approach is divergent in courtyards. This paper evaluates the accuracy of SfM point clouds against Terrestrial Laser Scanning (TLS) for these large architectural spaces with a symmetrical configuration, with the main courtyard of Casa de Pilatos in Seville, Spain, as a case study. Two different SfM surveys were conducted: (1) Without control points, and (2) referenced using a total station. The first survey yielded unacceptable results: A standard deviation of 0.0576 m was achieved in the northwest sector of the case study, mainly because of the difficulty of aligning the SfM and TLS data due to the way they are produced. This value could be admissible depending on the purpose of the photogrammetric model.
Highlights
IntroductionBoth the national and regional public administration make great efforts in the conservation of the historical heritage in order to ensure its social, economic and cultural benefits
The accuracy of SfM in large-scale buildings is evaluated in relation to Terrestrial Laser Scanning (TLS) through two surveys: Firstly, considering the camera position in a survey of less than 1 h and 30 min; secondly, a more accurate and longer survey with total station control points to enhance the 3D reconstruction
The lack of GCPs in the survey affects the geometric deviation between SfM and TLS
Summary
Both the national and regional public administration make great efforts in the conservation of the historical heritage in order to ensure its social, economic and cultural benefits. International organisations such as the International Council on Monuments and Sites (ICOMOS) or the International. Committee of Architectural Photogrammetry (CIPA) were founded with clear objectives of applying different measurement and visualisation technologies to register, document and preserve the cultural heritage. The analysis of heritage allows the virtual reconstruction of the lost spaces over time, supported by modern surveying technologies to digitally document and preserve the landscape and the historical heritage [1].
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