## 3 Results and Discussion
The photogrammetric study examples of large objects using UAV aimed to show how to adjust shooting technology to dense subtropical vegetation conditions and to select suitable plans and flyby algorithms. Scaling and georeferencing of the resulting models was performed based on the drone's built-in GPS module. The resulting accuracy was sufficient to submit a primary exploration documentation of the identified archaeological objects, which was one of the expedition's objectives. **Photogrammetry of medium-sized stationary objects**: included the architectural elements of the sites, the boundaries of excavations and pits, and small- and medium-sized temples, which constitutes the scale of photogrammetry utilized during the Markul expedition. The Markul temple and the temple area (Figure 15), including the Alakhash-abaa tower (Figure 16), were filmed after the completion of excavations, which, in 2017, marked the beginning of the use of photogrammetry in this project. Three-dimensional models were obtained for both objects, and tower wall profiles were obtained from various projections. This made it possible to establish that the tower was built in the Roman style described in the works of [PERSON] [15]. Since 2017, the expedition has collected photogrammetry data from more than three dozen churches in Abkhazia and seven churches in Greater Sochi. Photogrammetry projections and sections were published in the first part of the document--a catalogue of late antique and medieval Christian churches in the North-Eastern Black Sea region [16]. Figure 16: Illustration of the use of beams in the construction of the Alahash-Abaa tower: view of the 3D model from different angles. Figure 15: Plan of the excavation of the Markul temple. Because of the continuous nature of shooting, obtaining a 3D model of an object is generally not very challenging. The difficulty is the inaccessibility of shooting the upper part of the temple, if it is high, although the majority of Abkhazian temples explored by the expedition were not well preserved, which made it possible to build full 3D models [11]. It should be noted that the large temples explored by the expedition were mostly in good condition and remained at their full height. Therefore, for the complete photogrammetry, it was necessary to use UAVs. The techniques used were the same of those described above, and consisted of several shooting cones from different heights at different angles. Moreover, with a UAV, the inconvenience of shooting from a tripod is avoided, since it becomes possible to shoot the inaccessible upper zones of the walls and roof. The photogrammetry Bzpb temple is a successful example of using the UAV (Figure 18). Initially, using the DJI Mavic Mini drone, three circular series of photos were taken from the inside of the temple with a gradual increase in height. Then, due to the absence of a roof, the shooting was continued from the outside with an exit through the upper opening without breaking the series, which made it possible to obtain the internal and outer surface of the site, without using any artificial methods. The result is a high-quality model of the temple that can be analyzed in detail, from which the necessary dimensions can be taken and drawings can be made (Figure 19). The scaling of the model is crucial for the further processing of the data obtained in the model analysis. To maintain the required accuracy within the boundaries of the object, scale bars were installed. These were photographed and restored in 3D together with the object, which, during processing, allowed us to build a full-size 3D model, to locate virtual scale bars in the correct places, and to make scaled projections and cuts in order to obtain the final 2D drawing. Additionally, control dimensions of the most peculiar details of the object were calculated, which allowed us to check and refine the obtained data. The excavations were recorded using a tacheometer. The drawings were made using a local coordinate system.