ISPRS-Archives ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ISPRS-Archives Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. 2194-9034 Copernicus Publications Göttingen, Germany 10.5194/isprs-archives-XLII-2-W9-39-2019 INTEGRATION OF SURVEYING TECHNIQUES TO DETECT THE IDEAL SHAPE OF A DOME: THE CASE OF THE ESCUELAS PÍAS CHURCH IN VALENCIA Artese S. 1 Lerma J. L. 2 https://orcid.org/0000-0001-9443-9214 Aznar Molla J. 3 Sánchez R. M. 3 Zinno R. 4 Department of Civil Engineering, University of Calabria, Cubo 45/B, Via Pietro Bucci, 87036 Rende (CS), Italy Photogrammetry & Laser Scanner Research Group (GIFLE), Department of Cartographic Engineering, Geodesy and Photogrammetry, Universitat Politècnica de València, Cº de Vera, s/n, Building 7i, 46022 Valencia, Spain Department of Architectural Constructions, Universitat Politècnica de València, Cº de Vera, s/n, Building 1b, 46022 Valencia, Spain Department of Informatics, Modeling, Electronic and System Engineering, University of Calabria, Via P. Bucci cubo 42C, 87036 Rende, Italy 31 01 2019 XLII-2/W9 39 43 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ This article is available from https://isprs-archives.copernicus.org/articles/isprs-archives-XLII-2-W9-39-2019.html The full text article is available as a PDF file from https://isprs-archives.copernicus.org/articles/isprs-archives-XLII-2-W9-39-2019.pdf

The three-dimensional (3D) documentation and surveying of cultural heritage can be carried out following several geomatics techniques such as laser scanning and thermography in order to detect the original 3D shape after applying reverse engineering solutions. In almost all cases, the integration of data collected by different instruments is needed to achieve a successful and comprehensive 3D model of the as-built architectural shape of the historical building. This paper describes the operations carried out by the authors to determine the as-built 3D model of the Escuelas Pias Church, related namely to the dome and circular nave. After the description of the church and historical notes, attention will be driven to the indirect registration results obtained with three different laser scanning software packages, highlighting similarities and differences, and the consequences while generating meshes. The 3D model carried out will then be described and the results of some investigations with regard to the hypotheses about the design of the dome and the origin of the alterations will be presented.