### Applications of UAV Photogrammetry in CH Field  
Three-dimensional models or orthophotos in high geometric resolution, generated by an image acquired by UAS, are present many papers. [PERSON] et al., 2013 [9], described a special procedure used in Pompei on the Area of the Theatres of Pompei (Italy), processing aerial data and reconstructing the 3D model using innovative geomatic technologies; in this latter study, copter 4 drone (rotary wing/helicopter) was used for the research. [PERSON] and [PERSON] [10] described a methodology to obtain information on the architecture of pre-Columbian archaeological sites in Mexico using a Wings S800 hexecopter with the Sony Nex7 camera. [PERSON] et al. [11] described an aerial survey carried out by a DJI Spark drone during the excavations of the Naples (Italy) underground. Indeed, numerous archaeological finds were found in the excavations of the \"Toledo\", \"Municipio\", \"Universita\", and \"Duomo\" stations, attributable to different periods of the city of Naples (medieval, Roman, and Greek). [PERSON] et al. [12] compared two types of survey, LiDAR and UAV photogrammetry, with an SfM approach; the experiment was conducted on one of the most remarkable ancient sites in the county of Cornwall (South West England), namely Chun Castle. [PERSON] et al. [13] described the UAV photogrammetry applied to 20 Ghanpur temples, a group of 12 th-century stone temples different in design and size that are located near Warangal in Telangana (India). To build a 3D model of this structure, images acquired by the DJI Phantom 4 Pro UAS were processed by Pix4 Dmapper Desktop software. [PERSON] et al. reconstructed an ancient Kanytellis village house three-dimensionally using a photogrammetric method using an Anafi Parrot HDR, comparing the results obtained from the analysis of two different software, Agisoft Metashape (Agisoft LLC, St. Petersburg, Russia) and Context Capture (Agisoft LLC, St. Petersburg, Russia) [14]. Additionally, in the field of architecture, many works have been presented. [PERSON] et al. [15] described a UAS survey methodology adapted to build, in a simple and fast way, 3D models of complex structures; in particular, it showed a case study of a historical masonry bridge built in the mid-1800s located in southern Italy. The authors analysed the potential of the developed method and discovered that it could enable the realisation of a maintenance or restoration project. [PERSON] et al. [16] discussed the integration of geomatic techniques for the location of lost hermitages. To achieve this aim, SfM algorithms were applied to UAV images to produce an orthophoto of seven hermitages belonging to the monastery of Fara in Sabina (Italy). In this latter case, the orthophoto was subsequently compared with the 1820 map belonging to the Gregorian Cadastre. The comparison resulted in the location of two lost hermitages, while the other two are yet to be discovered. In the paper by [PERSON] et al. [17], a method aimed at creating an accurate model of historical architecture and landscape of complex geometries was presented. the authors, through terrestrial and UAV photogrammetric techniques, proposed methods related to the combination of photographs, highlighting the defects resulting from the automatic process of combination and possible corrections to be implemented. In addition, this latter paper presented verification of the reconstruction of a monument with a complex geometric shape, comparing it with a model obtained using a LiDAR point cloud. Photogrammetry from UASs has also been used in the case of the Isabel II dam, built in the mid-19 th century, a monumental hydraulic structure located in Spain in order to conduct an investigation of the current state of the dam and adjacent constructions; the point cloud obtained from the photogrammetric process, combined with the historical data, was used as the basis for generating a historical building information model (HBIM) [18]. [PERSON] et al.