Acquisition protocols for UAV photogrammetric data. Comparison in methodological SfM procedures from architectural till urban scale.

The importance assumed by the photographic instrument for the documentation of the architectural and townscape heritage has seen the increase in the use of manageable and performing UAVs, aimed at the production of reliable photogrammetric databases from which to extrapolate from the detailed up to the cartographic drawings. The paper discusses the application of some commercial DJI drones tested on different contexts, in order to evaluate the updating of the product used in reference to the case study and the developed a methodological protocol that produces an output to integrate, support or, in some cases, replacement of other digital terrestrial instrumentation outputs