This article examines the application of non-contact geodetic methods for the digitisation and preservation of cultural heritage sites in a critical state of disrepair. The subject of the study is the fortified Church of the Holy Trinity (1590–1600) in the village of Sokolivka, Lviv Oblast. The aim of the study is to justify and implement a methodology for creating a three-dimensional polygonal textured model (mesh model) of the fortified church based on the synthesis of terrestrial laser scanning and photogrammetry data. Field surveys were carried out using a Trimble TX6 scanner (48 stations) and a digital camera (1,447 images). Initial processing of the scans was carried out in Trimble RealWorks, whilst precise orientation, polygonal mesh generation, decimation and projection texturing were performed using RealityCapture software. The result is a three-dimensional polygonal textured model that reproduces, with millimetre accuracy, the spatial geometry of the building, its deformations, as well as the preserved interior elements and fragments of frescoes. The technical challenges are highlighted: the impact of vegetation on geometric noise, the resource-intensive nature of texturing, and the presence of ‘blind spots’ in the upper part of the roof when capturing images from the ground. The resulting three-dimensional polygonal textured model serves as a reliable basis for monitoring deformations, scientific and restoration work, and the virtual reconstruction of the monument.
Gabellone, F. (2022). Digital twin: A new perspective for cultural heritage management and fruition. Acta IMEKO, 11(1), 7–14.
Kalynych, I. V., Gubar, Y. P., Chetverikov, B. V., & Vash, Y. I. (2023). Comparison of 3D models of objects created from terrestrial laser scanning data. Modern Achievements of Geodesy and Geospatial Production, 1(45), 112–118. https://doi.org/10.33841/1819-1339-1-45-112-118
Korzheva, A. (2017). Defensive complex of the Church of the Holy Trinity in Sokolivka village, Zhydachiv district, Lviv region: History and current condition. Bulletin of the Lviv National Academy of Arts, 34, 169–180. https://doi.org/10.5281/zenodo.1170626
Matsiuk, O. (2005). Castles and fortresses of Western Ukraine: Historical journeys. Center of Europe.
Niccolucci, F., Felicetti, A., & Hermon, S. (2022). Populating the data space for cultural heritage with heritage digital twins. Data, 7(8), 105. https://doi.org/10.3390/data7080105
Pshyk, V. (2008). Fortified towns, castles, defensive courtyards and incastellated sacred buildings of Lviv Region, 13th–18th centuries: Catalogue and information guide. Carpathian Foundation.
Razali, A. F., Ariff, M. F. M., & Majid, Z. (2022). A hybrid point cloud reality capture from terrestrial laser scanning and UAV photogrammetry. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLVI-2/W1, 459–463.
Smolii, V. A., Boriak, H. V., Danylenko, V. M., Kot, S. I., Parkhomenko, M. T., Reient, O. P., & Rublov, O. S. (2015). Cultural heritage in the context of the “Register of monuments of history and culture of Ukraine”. Institute of History of Ukraine, National Academy of Sciences of Ukraine.
Yanchuk, R., Yanchuk, O., Trohimets, S., Androsyuk, M., Savchyn, I., & Lozynskyi, V. (2024). Creation of a three-dimensional model of a religious building based on combined geodetic surveys. Modern Achievements of Geodesy and Geospatial Production, 1(47), 101–109.
Savchyn, I., & Repechovych, S. (2024, October). Historical virtual reconstruction of Przemyśl Fortress forts using geodetic methods: the case of I/4 Maruszka Las Fort in Ukraine. In International Conference of Young Professionals «GeoTerrace-2024» (Vol. 2024, No. 1, pp. 1-5). European Association of Geoscientists & Engineers. https://doi.org/10.3997/2214-4609.2024510027
Savchyn, I., Lozynskyi, V., Romanyshyn, O., & Malanchuk, M. (2025, October). Geodetic monitoring of roof deformations in repurposed structures: A case study from Rivne, Ukraine. In Proceedings of the International Conference of Young Professionals GeoTerrace-2025 (pp. 1–5). European Association of Geoscientists & Engineers. https://doi.org/10.3997/2214-4609.202552020
Danyliv, N., Savchyn, I., Serebrianskyi, D., & Austin, T. (2026). Methodology for collecting and processing data to diagnose the technical condition of a building: A case study of the State Tax University in Irpin (Ukraine). AVN – Allgemeine Vermessungs-Nachrichten, 133(1), 16–25. https://doi.org/10.14627/avn.2026.1.2