Modern Determination of Vertical Deflections Using Digital Zenith Cameras

Determination of Astro-Geodetic Vertical Deflections using Digital Zenith Camera System in Istanbul, Turkey

The Digital Zenith Camera - A New High-Precision and Economic Astrogeodetic Observation System for Real-Time Measurement of Deflections of the Vertical

During the last few years, new developments in the field of geodetic astronomy have been sparsely published. This might be due to the fact that the determination of deflections of the vertical still required relatively large efforts, both in time and in manpower, thus keeping the costs per point at a high level. Recently, the development of new high performance image sensors (CCD) at a reasonab...

Digital Zenith Cameras – State-of-the-Art Astrogeodetic Technology for Australian Geodesy

Over recent years, significant progress has been made in astrogeodetic research with the development of digital zenith camera systems (DZCSs) at ETH Zurich, Switzerland, and the University of Hanover, Germany. The use of charged coupled device (CCD) sensors for star imaging improved the degree of automation, accuracy and efficiency of this modern astrogeodetic instrumentation. With DZCSs, verti...

The Use and Abuse of Vertical Deflections

This paper reviews the deflection of the vertical and its use and abuse in geodetic surveying. ‘Importantly, the deflection of the vertical in Australia will change by around 6” upon the implementation of the Geocentric Datum of Australia (GDA94). Therefore, for some applications, the deflection of the vertical may no longer simply be neglected in survey computations and adjustments. With the r...

Estimation of Vertical Deflections in Concrete Beams through Digital Close Range Photogrammetry

Deformation monitoring, and in general structural health monitoring, of civil infrastructure systems is important in terms of both safety and serviceability. Traditionally, large structures have been monitored using surveying techniques, while fine-scale monitoring of structural components has been done with geotechnical instrumentation. This paper reviews the advantages and disadvantages of us...