The Use of the Automated Digital Zenith Camera System in Istanbul for the Determination of Astrogeodetic Vertical Deflection

Albayrak, Muge; Halicioglu, Kerem; Ozludemir, M. T.; Basoglu, Burak; Deniz, Rasim; Tyler, Allison R. B.; Aref, Mohammad M.

doi:10.1590/s1982-21702019000400025

Cited by 11 publications

(3 citation statements)

References 45 publications

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“…A determinação das coordenadas geodésicas tratase de uma tarefa atualmente relativamente simples se comparada aos métodos astronômicos, os quais requerem, imprescindivelmente, boas condições climáticas e elaboração de listas de estrelas para a observação dos astros, além da habilidade do observador para realizar as leituras. Importante ressaltar que há trabalhos que utilizam câmaras digitais zenitais para tomadas de imagens dos astros, otimizando e facilitando assim as leituras e cálculos astronômicos; exemplos de trabalhos: Albayrak et al (2019), Halicioglu, Deniz e Ozener ( 2016) e Vittuari et al (2016).…”

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Programa computacional científico para a elaboração automática de listas de estrelas para astronomia de posição (LEDAP): revisão dos conceitos e exemplo de aplicação

Pereira

Jerez²,

Camargo³

2020

R. bras. Geom.

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É apresentado o LEDAP, programa computacional científico que elabora automaticamente listas de estrelas para a determinação astronômica de precisão da latitude (método de Sterneck), longitude (método das distâncias zenitais absolutas) e azimute (método das estrelas em circum-elongação). As aplicações das listas nas práticas de Astronomia de Posição possibilitam a rápida obtenção de coordenadas astronômicas e respectivos desvios-padrões. O conhecimento das coordenadas astronômicas e geodésicas (juntamente com as precisões) de um ponto permite o observador estimar pelo método astrogeodésico as componentes meridiana (ξ), 1° vertical (η) e o desvio da vertical (i), bem como, os respectivos desvios-padrões por propagação de covariâncias. Neste trabalho, a partir do uso de um teodolito de leitura direta de 1” e de um receptor de dupla frequência foram obtidas as coordenadas astronômicas e geodésicas (posicionamento relativo estático) de um pilar de concreto localizado na UNESP, câmpus Presidente Prudente/SP, bem como, as componentes e o desvio, sendo ξ = 3,3339 ± 3,3323”, η = –54,8849 ± 4,5255” e i = 54,9861 ± 4,5217”. Verificou-se que devido às precisões das coordenadas astronômicas serem inferiores às geodésicas, as precisões das componentes e do desvio foram da ordem de 4,5”, independentemente do método de posicionamento por satélites utilizado, com exceção do Posicionamento por Ponto Simples (PPS) que degradou as estimativas.

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Section: Página | 165unclassified

Programa computacional científico para a elaboração automática de listas de estrelas para astronomia de posição (LEDAP): revisão dos conceitos e exemplo de aplicação

Pereira

Jerez²,

Camargo³

2020

R. bras. Geom.

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“…These systems inspired many researchers elsewhere to develop their own DZCs, such as in Latvia [14,15] and Turkey [16,17]. The DIADEM was recently upgraded to the COmpact DIgital Astrometric Camera (CODIAC), and two CODIACs-'Blue' and 'Red'-were created.…”

Section: Introductionmentioning

confidence: 99%

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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“…This method is implemented in the traditional technique used in existing DZCS (Albayrak et al 2019;Hirt et al 2010;Tian et al 2014;Somieski 2008).…”

Section: Introductionmentioning

confidence: 99%

Results of Astro-Measurements of the Deflection of Vertical Using the New Observation Technique

Murzabekov

Fateev

Pruglo

2022

International Association of Geodesy Symposia

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The initial information for the development of high-degree models of the Earth's gravitational field (EGF) are the results of satellite and ground-based measurements. At the same time, satellite measurements carry information on the long-wave structure of the EGF. Information on the short-wave structure of the EGF can be obtained only on the basis of ground-based measurements. Having organized the determination of deflection of vertical (DOV) with a resolution of several kilometers, the local structure of the EGF can be restored with the highest possible resolution. This can be done using digital zenith camera systems (DZCS). They are automated and allow to determine the components of the DOV at the point of placement in real time. The article presents the developed measurement technique with a DZCS and the results of its tests at various geographical points in the field. The proposed technique, unlike the existing traditional technique, allows to evaluate and take into account the calibration coefficients of the DZCS in each series of observations. In addition, the new proposed technique does not impose requirements on the accuracy of rotation of the telescope around the axis in the horizontal plane and the rigidity of the base of the DZCS. The test results of the new technique showed that the standard deviation of measurements is about 0.1″–0.3″.

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The Use of the Automated Digital Zenith Camera System in Istanbul for the Determination of Astrogeodetic Vertical Deflection

Abstract: This content is licensed under a Creative Commons Attribution 4.0 International License.

Cited by 11 publications

References 45 publications

Programa computacional científico para a elaboração automática de listas de estrelas para astronomia de posição (LEDAP): revisão dos conceitos e exemplo de aplicação

Programa computacional científico para a elaboração automática de listas de estrelas para astronomia de posição (LEDAP): revisão dos conceitos e exemplo de aplicação

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

Results of Astro-Measurements of the Deflection of Vertical Using the New Observation Technique

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