Built-in cameras are nowadays standard in modern total stations, but their possible potential of photogrammetric evaluation and analysis is not yet used. This article describes a research project for bridge monitoring using such an instrument at the Fatih Sultan Mehmet Bridge in Istanbul. By image processing algorithms an active LED target is detected and by using the exterior orientation of the total station brought directly into a suitable coordinate system. Thus, additional reference marks in the camera image become obsolete. After the description of the system the practical usability for detecting bridge motions is confirmed by two test measurements and a number of oscillation frequencies derived. So this article shows an example of additional measuring tasks for which video-tacheometer can be employed.     «

Built-in cameras are nowadays standard in modern total stations, but their possible potential of photogrammetric evaluation and analysis is not yet used. This article describes a research project for bridge monitoring using such an instrument at the Fatih Sultan Mehmet Bridge in Istanbul. By image processing algorithms an active LED target is detected and by using the exterior orientation of the total station brought directly into a suitable coordinate system. Thus, additional reference mark...     »