Abstract
Since finalizing of design in 2016, the digital zenith camera of the University of Latvia was involved in a number of test observations as well as field observations at about 70 different sites. The paper presents analysis of observation results, estimation of instrument’s performance and accuracy. Random and systematic error sources are outlined. Impact of anomalous refraction on vertical deflection determination is discussed. Results of adaptation of GAIA reference star catalog for astrometric data reduction are reported.
Highlights
Design of digital zenith camera in the institute of Geodesy and Geoinformatics of the University of Latvia was concluded in 2016 (Zariņš, Rubans, & Silabriedis, 2016)
The most pronounced of them are variability in relative orientation of astrometric and leveling subsystems, caused, most probably by thermal deformations in construction elements of the instrument. Another major effect is caused by anomalous refraction, leading to variations in the measured value of vertical deflection itself
Variations of vertical deflection value, found in zenith camera measurements, with high probability can be attributed to anomalous refraction effects (Hirt, 2006; Hirt & Seeber, 2008; Hirt, Bürki, Somieski, & Seeber, 2010)
Summary
Design of digital zenith camera in the institute of Geodesy and Geoinformatics of the University of Latvia was concluded in 2016 (Zariņš, Rubans, & Silabriedis, 2016). Up to the end of 2017 a number of test observations at a fixed test site, as well as field observations at about 70 different sites were performed. A number of further improvements of design, measurement methodology and control and data processing software were inspired in the process. Analysis of collected data allow to draw conclusions about properties of the instrument and measurement results
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