Print Email Facebook Twitter Assessing historical church tower asymmetry using point cloud spatial expansion Title Assessing historical church tower asymmetry using point cloud spatial expansion Author Dabrowski, Pawel S. (Gdynia Maritime University) Zienkiewicz, Marek Hubert (Politechnika Gdanska) Truong-Hong, Linh (TU Delft Optical and Laser Remote Sensing) Lindenbergh, R.C. (TU Delft Optical and Laser Remote Sensing) Date 2023 Abstract Church towers are key cultural heritage. In theory, towers are vertical, while facade elements are symmetrically positioned around the tower axis. However, during service of a structure, building and lifetime conditions cause deviations, with associated risks. Laser scanning point clouds can be used to assess the structural state but a universal approach was missing. The proposed algorithm first estimates the tower inclination, and tests which multi-axis representation best represents the course of the tower. Next, point cloud spatial expansion recovers relative distances and deviations of facade elements. The resulting procedure was applied to assess two Dutch medieval towers including the Old Church in Delft and the St. Bavo Church in Haarlem, respectively. As results of analysis, significant asymmetry was found with a 1.4° deviation of the multi-modal axis of the St. Bavo Church tower together with variations of 0.1%–1.5% for facade slopes, while 0.1°–3.1° radial deviations were found in the position of the turrets of the Old Church tower. Subject AsymmetryHistorical buildingsPrismatic PCSE To reference this document use: http://resolver.tudelft.nl/uuid:72800417-d1dc-42dd-8bac-8115cd5da3a9 DOI https://doi.org/10.1016/j.jobe.2023.107040 Embargo date 2023-12-08 ISSN 2352-7102 Source Journal of Building Engineering, 75 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2023 Pawel S. Dabrowski, Marek Hubert Zienkiewicz, Linh Truong-Hong, R.C. Lindenbergh Files PDF 1_s2.0_S2352710223012196_main.pdf 13.23 MB Close viewer /islandora/object/uuid:72800417-d1dc-42dd-8bac-8115cd5da3a9/datastream/OBJ/view