Field comparison of the total station-based QDaedalus and the zenith telescope-based CODIAC astrogeodetic systems for measurements of the deflection of the vertical

Albayrak, Muge; Willi, Daniel; Guillaume, Sébastien

doi:10.1080/00396265.2022.2054108

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…The main applications of DoVs include geoid or quasi-geoid determinations and geoid validation, as well as other applications such as correcting precision engineering measurements [18]. CODIAC DZCs were used for various survey campaigns in Switzerland (e.g., [19,20]) and the determination of a precise gravity field and geoid slope validation surveys in USA [21][22][23]. Like the CODIAC, the Latvian DZC VESTA, was used for dense DoV measurements within Latvia; these obtained DoVs were then used for quasi-geoid determinations [24].…”

Section: Introductionmentioning

confidence: 99%

“…This is of particular interest since the VESTA concept differs from other DZCs, especially in its DoV calculation strategy. As the CODIAC has an established accuracy higher than 0.05 [19], the comparison between the VESTA and CODIACs allowed for the precision validation of VESTA using CODIAC as a reference, as well as determining the agreement between the DZCs.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Measurements of Astrogeodetic Deflection of the Vertical by Latvian and Swiss Digital Zenith Cameras

Varna

Willi²,

Guillaume

et al. 2023

Remote Sensing

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Nowadays, zenith telescope-based digital zenith cameras (DZC), such as the COmpact DIgital Astrometric Camera (CODIAC) and VErtical by STArs (VESTA), are used to determine highly precise astrogeodetic deflections of the vertical (DoVs). The CODIAC and VESTA were developed by Eidgenossische Technische Hochschule (ETH) Zurich and University of Latvia, respectively, and only two CODIACs and four VESTAs were produced. The CODIAC has an established accuracy higher than 0.05″, while the accuracy of VESTA is ~0.1″. These two DZCs, which are the most used DZCs of the last decade, were used effectively over many survey campaigns. In this study, we used both the CODIAC and VESTA to conduct simultaneous observations at the School of Management and Engineering Vaud (HEIG-VD) in Yverdon-les-Bains, Switzerland, over five nights in August 2021. Our DZC measurements with CODIAC and VESTA mark the second time that simultaneous parallel observations were made with two different DZCs. Additionally, the VESTA was never tested against another DZC through comparative simultaneous measurements. These comparative measurements between the VESTA and CODIAC allowed for VESTA precision validation and checking the agreement between the two DZCs. The results of repeated, comparative DoV observations over five nights at HEIG-VD revealed a DoV measurement precision of VESTA around 0.13–0.16″ for 15 min long observation session and 0.10–0.13″ for 50 min long observation session. Mean DoV differences between CODIAC and VESTA at HEIG-VD were 0.08″ and −0.06″ for the North–South and East–West components, respectively.

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