Publications
A Semantic Classification Approach for the Aachen Cathedral
A novel semantic classification approach, integrating 3D survey data and machine learning, demonstrates significant potential for distinguishing materials and construction techniques in historic masonry, particularly at UNESCO World Heritage sites like Aachen Cathedral. The study, focusing on the Westwerk area, combines terrestrial laser scanning (TLS) and photogrammetric point clouds with supervised algorithms (Random Forest) and 2D image segmentation via META’s Segment Anything Model (SAM). Findings reveal that 3D geometry-based classification excels in identifying features with strong morphological differentiation, while 2D approaches are more effective for visually subtle or geometrically similar elements. Annotated 2D masks projected onto the 3D model enhance classification reliability, contributing to scalable, semi-automatic documentation and conservation planning for complex heritage sites.
Radiocarbon measurements of iron girders from Aachen cathedral
Radiocarbon dating of iron girders from Aachen Cathedral reveals that the Carolingian Palace Chapel's construction dates between CE 793 and 813, aligning with historical records. The study demonstrates the reliability of this method for ancient iron, though it highlights challenges due to contamination from exogenous carbon sources such as old wood, flux additives, or modern reconstruction materials. Notably, iron beams from the Gothic Annex showed variable radiocarbon signatures, likely due to medieval forging techniques and recent welding with fossil carbon. The research also compared iron dates with those of contemporary wood and charcoal, providing a robust age reference framework.
Evolution of Recording Methods: The Aachen Cathedral World Heritage Site Documentation Project
A collaborative project has successfully demonstrated the application of modern terrestrial laser scanners and photogrammetric imaging systems to create highly accurate 3D documentation of the Aachen Cathedral. This method provides objective as-built records that support conservation, management, monitoring, and repair efforts while serving as an educational resource. The study compares these advanced recording techniques with previous documentation work done at the Cologne Cathedral, highlighting their effectiveness for architecturally complex heritage sites.
The Vaulting System of the Palatine Chapel: The Aachen Cathedral World Heritage Site Documentation Project
A novel analysis of the Palatine Chapel's conic vaults, part of Aachen Cathedralreveals a sophisticated VIII/IX century architectural solution. Using 3D point cloud data from extensive capturing campaigns (2022–2023), researchers reconstructed idealized geometric models of these vaults and compared them with actual structural data. The study highlights the precision of conic surface extraction and unfolding techniques, producing high-resolution ortho-images that offer unprecedented insights into the chapel's structural integrity and historical design. This method sets a benchmark for digital documentation of heritage sites, bridging gaps between idealized geometry and real-world construction.
Real Walking in Virtual Spaces: Visiting the Aachen Cathedral
Spatial compression techniques enable users to traverse larger virtual environments than their physical tracking area allows, enhancing the immersive experience of Virtual Reality (VR). This demo showcases ongoing research by demonstrating real walking through a detailed model of Aachen Cathedral within a room-sized tracking space. By addressing the mismatch between VR tracking limits and virtual environment size, this approach preserves the natural intuitiveness of walking while expanding exploration capabilities in VR applications.
Retrofitting Aachen Cathedral with an Innovative Flexible Textile Reinforced Mortar Bandage / Innovative und denkmalgerechte Verstärkung des Aachener Doms mit einer flexiblen, textilbewehrten Rissbandage
A groundbreaking method for retrofitting historic structures using flexible textile-reinforced mortar bandages has been successfully applied to Aachen Cathedral. This innovative approach demonstrates significant potential for strengthening masonry while preserving its aesthetic and structural integrity. The study involved the application of a lightweight, flexible reinforcement system that effectively bridges cracks and enhances load-bearing capacity without altering the monument's visual character. By combining modern materials with traditional conservation techniques, this method offers a sustainable solution for the long-term preservation of cultural heritage sites facing structural deterioration.
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