The use of low-cost UAVs (Uncrewed Aerial Vehicles) for documenting and creating 3D models of archaeological and architectural sites as well as geographical areas is becoming increasingly popular. As this technology has become more widespread, the need to test the precision of the acquired data, the accuracy of the models, and the level of detail of the final products has also become vital. The first chapters of this thesis briefly report the history, application areas, and fundamental principles of photogrammetry and UAV photogrammetry. The following sections focus on the selected case studies, drones and camera models, and post-processing methods in software.