Scholarly record

MULTI-SOURCE DATA INTEGRATION OF UAS AND TERRESTRIAL CLOSE-RANGE PHOTOGRAMMETRY FOR COMPREHENSIVE 3D RECONSTRUCTION OF THE "ST. JOHN LETNI" CHAPEL

Tsvetelina Atanasova-Evdenova, Nikolay Angelov, Yana Lipiyska

Abstract

This study presents the application of integrated UAS and terrestrial close-range photogrammetry for the comprehensive 3D reconstruction of the cultural heritage site “St. John Letni” chapel, located near Pchelina Reservoir, Bulgaria. The main objective of the research is to produce detailed and accurate documentation of the chapel in its current condition, supporting its long-term preservation and potential restoration. The data acquisition combines aerial imagery from an unmanned aerial system (UAS) and terrestrial photogrammetric data to ensure complete coverage of both the exterior and interior of the site. Due to challenging lighting conditions during image capture, including strong sunlight, cast shadows, and reflections of the icons in the interior, part of the dataset required preliminary processing. This included exposure correction of overexposed images and the creation of image masks to improve the quality of subsequent photogrammetric processing. Using the Structure-from-Motion (SfM) approach in combination with pre-planned UAS flight missions, a high-resolution photorealistic 3D model of the object is generated. In addition, facade plans and orthophoto mosaics are produced, accurately representing the architectural and artistic features of the chapel.

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