Detection of Gross Errors in the Elements of Exterior Orientation of Low-Cost UAV Images

In recent time we can observe growing interest of the photogrammetric products, which were made with using imagery acquired from low altitudes with the use of unmanned aerial vehicles (UAV). Due to the lower costs of UAV photogrammetry flight missions they are often attractive from the point of view of photogrammetry. In realization of photogrammetric flight missions at low altitude so far not completely resolved are too small accuracy of registration approximate exterior orientation of acquired images. The second very important aspect of accuracy of studies is fact, that software is not resistant to errors in the estimated elements of the exterior orientation parameters. The article presents a method of pre-adjustment gross errors detection in the measurement of projection centers. The method is largely based on the analysis of the results of two independent approaches: theoretical results of exterior orientation and alignment as a result of bundle block adjustment.