Abstract: As a case study, Huashan rock paintings in Ningming county, Chongzuo city, Guangxi are analyzed by using UAV close photogrammetry technology to research 3D model modeling of tangible cultural heritage. The goal is to explore digital archival technology and methods suitable for 3D modeling of cultural heritage, including rock paintings, carvings, and ancient buildings. The study reveals that the initial terrain model is created through the collection of initial terrain image data using close-range photogrammetry technology on unmanned aerial vehicles (UAVs), the planning of refined routes based on the initial terrain model, and the implementation of high-resolution photogrammetry. The resulting refined 3D model has high resolution, clear texture, and accurately restored character information. The research findings can offer precise guidelines on 3D modeling technology for related fields that involve acquiring geospatial information, like safeguarding natural and cultural sites. This technology holds promising potential for wider circulation and usage.

Key words: nap-of-the-object photogrammetry, refined route planning, 3D modeling, UAV, tangible cultural heritage