## 3 Results and Discussion
However, as controls, the obtained measurements in the local coordinate system were used while scaling the final photogrammetric model. Georeferencing in GIS was achieved using the final models according to the GPS data of the reference points. The existing error in the GPS measurements, on the scale of the entire GIS, was insignificant. Figure 5:0 An example of camera movement during the photogrammetry of the Kulanurhua temple (Figure 2, No. 4). Figure 5:1 Orthophotoplan of the Bzyb temple. Figure 5:2 Illustration of the flight trajectory around the Bzyb temple. When using photogrammetry methods for medium-sized objects, in order to obtain a proper result, the following rules should be considered:  
1. Lighting. Bright sunlight leads to the images with strong contrast, which make the automatic determination of control points almost impossible, thus affecting the accuracy of the model. High-contrast shots also greatly damage the texture quality. Therefore, cloudy weather with diffused soft light is preferable for shooting. Overcast conditions are also inconvenient since the illumination drops dramatically, which requires a long exposure, and the majority of the objects are located in the forest. With this type of shoot, the photographs will sometimes be blurry and unsuitable for processing. 2. Preparation of the object. To obtain a high-quality 3D model, the key point is to preliminarily clear the vegetation. All bushes, branches, foliage, and grass should be removed from the object, as they greatly interfere with the shots at the processing stage. Tree trunks, however, practically do not affect this, since they are easily cut out of the finished model. 3. Shooting edges and corners. A thorough survey of the corners of the buildings is vital for high-quality stitching of the adjacent wall surfaces. It is better to capture more shots at the corners than artificially stitch the model from several parts later. The development of photogrammetry for this group of archaeological objects can be demonstrated in the visualization of the dynamics of two excavations. In the first case, the models of successive excavations of the \"Castle\" of the Markul settlement were combined, i.e., the collapsed tower was cleared of vegetation before excavations in 2019 and the successive stages of opening the area in 2020 and 2021. This made it possible to obtain a 3D picture of the sequential opening of the site and to analyze it fully in terms of geometry and stratigraphy, to obtain sections and profiles of the walls (Figure 20). In the second case, layer-by-layer photogrammetry of the 2021 excavation site on the southwestern slope of the settlement was performed, which was rich in archaeological material. By combining 3D models of the sequential opening stages, a dynamic picture of the discovery process was obtained (Figure 21). In addition to a purely scientific result, we  
Figure 5:3 The combined model of the castle excavation site for the 2019–2021 season. captured a remarkable and informative video visualization, which will later be included in the virtual exhibition of the Markul settlement museum. A photogrammetric model of a temple or excavation site is not always the final product. After compiling dozens of architectural drawings of ancient and medieval temples in Abkhazia and Greater Sochi, it is undoubtedly true that \"a high-quality architectural drawing is the result of a long, sometimes painful analysis. It contains many interpretations; the material included in the drawing undergoes a significant selection, with which one can agree or argue, but this is a product created by a specialist and for specialists in their own language. Therefore, the model, no matter how perfect it is, cannot be a substitute for formalized drawings. It can only be a tool for the architect, who can use it to solve the assigned tasks\" [17]. Moreover, while photogrammetry certainly gives us more accurate results than manual measurements of objects, the resulting visualization angles are slightly different from the original sample.