How Photogrammetry Reveals the Millennial “Spring of Nerik”?

In the heart of Turkey's Samsun province lies a 6,500‑year‑old archaeological site: ancient Nerik, a Hittite cult city. Since 2005, the Oymaağaç Höyük project has used automatic photogrammetry, or Structure from Motion (SfM), to turn hundreds of photos into 3D models. From these images arise point clouds, textured surfaces, orthophotos, sections, and even 3D‑printed replicas. Researchers can explore the site directly in a browser with Potree Viewer or dive into virtual reality via Babylon.js. Accuracy depends on image scale: the closer the shot, the finer the detail. Yet data volume explodes, making sustainable management tough with limited budgets. Despite these hurdles, photogrammetry proves a flexible tool for documenting artifacts of any shape or size, opening new paths for digital heritage preservation.

SfM photogrammetry leverages keypoint matching algorithms (SIFT, SURF, ORB) to reconstruct 3D geometry from overlapping images. After initial alignment, bundle adjustment simultaneously optimizes camera positions and 3D point coordinates, reducing parallax errors. Results are then densified using multi‑view stereo (MVS) methods, generating high‑density point clouds. For texture, color mapping based on orthogonal projections ensures realistic surface rendering. Data management requires workflows using open formats (e.g., LAS, OBJ, PLY) and versioning systems (Git‑LFS or DVC) to track model evolution. Integration with web platforms like Potree enables visualization of compressed point clouds via octree, while Babylon.js uses WebGL for real‑time interactive rendering. For VR, models are exported in Unity or Unreal‑compatible formats, allowing immersive experiences with motion tracking. Finally, 3D printing employs STL or OBJ files, with slicing processes optimized to preserve critical topographic details, facilitating tactile analysis by archaeologists and conservators.