UAV photogrammetry

Photogrammetry is a remote, image-based methodology that can be used to obtain precise measurements and three-dimensional (3D) models of objects, surfaces, or environments, based on photographs taken from multiple angles. It relies on the principles of triangulation, where overlapping images are processed to identify common points, enabling the calculation of spatial coordinates. Aerial photogrammetry used in Cultural Heritage applications generates high-resolution 3D models of artefacts, monuments, and sites through the principles of triangulation and bundle adjustment. The process involves systematic image acquisition using calibrated cameras and different sensors (UV-VIS-IR ranges), followed by feature detection, matching, and dense point cloud generation using Structure-from-Motion (SfM) algorithms. Aerial photogrammetry applications within HS: • High-precision field topography • Vestiges' identification based on level difference compared to adjacent areas • Digital elevation model (DEM) or digital terrain model (DTM), including LIDAR data • Acquisition of images at different wavelengths • Differences in vegetation • Thermal distribution and thermal stress assessments These models enable accurate documentation, geometric analysis, and virtual reconstruction, supporting conservation, research, and public engagement while preserving the integrity of cultural heritage objects.

Uav-lidar

Aerial photogrammetry

Imaging method

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