Existing UAVs can be used in large-scale and small-scale applications. The system price may vary within some orders of magnitude, depending on the complexity of the system. With costs between €1000 up to several millions of Euro, the system can be similar or even higher priced compared to a standard manned aircraft system. However, the focus of this study is more on low-cost UAV systems for applications. The subsequently presented advantages and limitations of UAV photogrammetry in comparison to the existing methods are thus mostly valid for low-cost systems and small-scale applications, only.