Author: W. Schauerte

Institution: Geodetic Institute of the University of Bonn

Co-Author: Dierk Deussen

Determination of Vertical Refraction Using Digital Working Sensors

Abstract:

In the age of very precise and automatically measuring instruments the sufficient determination of the vertical refraction represents still the main problem on geodetic observations. In connection with CCD-technologies (digital levelling instruments, theodolites) different effects become visible. On the other hand in detecting the mean square displacement of a reference target or a reference scale in the focal plane of a digital working sensor system (camera, 4Quad-detector, etc.) as a result from the atmospheric boundary layer turbulence, the short-time fluctuations of the refrective index are becoming noticeable. By using the similarity theory of the meteorologists MONIN-OBUCHOW it is possible and one practicable way to derive the vertical refraction from these short-time effects.