UAV multi-image matching approach for architectural survey in complex environments

Photogrammetric survey using UAV shows nowadays some aspects, especially related to the optimization of the operative workflows and best practices, that still need to be investigated. This work concerns the use of a small UAV for the documentation of an historical architectural complex, in which space constraints arises. The adoption of a rapid mapping workflow using frames extracted from videos is discussed, together with the exploitation of an automatic procedure for the acquisition of 360° shots, used for ensuring the minimum required overlap for a reliable and accurate image orientation.