Results 1 to 10 of about 35,629,504 (153)
Digital zenith camera for vertical deflection determination [PDF]
Geodesy and Cartography, 2012 Recent accomplishments in advancement of accurate astrometric reference star catalogues, development of digital imaging technology, high accuracy tiltmeter technology, and geocentric coordinate availability provided by GNSS, have made possible accurate ...
Māris Abele +5 more
doaj +3 more sources
Digital zenith camera of the University of Latvia [PDF]
Geodesy and Cartography, 2016 Design of digital zenith camera in Institute of Geodesy and Geoinformatics of the University of Latvia started in 2009. Now, after tests of a prototype, improvements of design and manufacturing of the second version, it has reached operational status ...
Ansis Zariņš +2 more
doaj +4 more sources
Modern Determination of Vertical Deflections Using Digital Zenith Cameras [PDF]
Journal of Surveying Engineering, - ASCE, 2010 At the beginning of the 21st century, a significant technological change took place in geodetic astronomy. In Zurich and Hannover, digital zenith camera systems were developed based on digital imaging sensors (charge-coupled device) that strongly improved the degree of automation, efficiency, and accuracy of the observation of the direction of the ...
Hirt, Christian +3 more
exaly +7 more sources
Remote Sensing, 2023 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).
Müge Albayrak +2 more
exaly +6 more sources
THE USE OF THE AUTOMATED DIGITAL ZENITH CAMERA SYSTEM IN ISTANBUL FOR THE DETERMINATION OF ASTROGEODETIC VERTICAL DEFLECTION [PDF]
Boletim De Ciencias Geodesicas, 2019 The Digital Zenith Camera Systems (DZCSs) are dedicated astrogeodetic instruments used to obtain highly accurate astrogeodetic vertical deflection (VD) data. The first Turkish DZCS, the Astrogeodetic Camera System (ACSYS), was developed in Istanbul, Turkey in 2015.
Müge Albayrak +2 more
exaly +8 more sources
Monitoring and analysis of anomalous refraction using a digital zenith camera system [PDF]
Astronomy and Astrophysics, 2006 Context. Anomalous refraction is considered to be a limiting factor for ground-based astrometry in general and astrogeodetic observations in particular. Typical characteristics of anomalous refraction are basically known by means of spot-check-data, however the fluctuation is rather little studied. Aims.
Hirt, Christian, C. Hirt
exaly +6 more sources
Digital Assessment of Gingival Display During Different Facial Expressions Using AutoCAD Software: An Exploratory Clinical Study [PDF]
International Dental JournalObjective: To explore and compare the extent of maximal gingival display among four different facial expressions, including the requested smile, Duchenne smile, grimace of disgust, and funnel-shaped expression, using AutoCAD software.
Rija Anees +2 more
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Accuracy analysis of vertical deflection data observed with the Hannover Digital Zenith Camera System TZK2-D [PDF]
Journal of Geodesy, 2007 This paper analyses the accuracy of vertical deflection measurements carried out with the Digital Zenith Camera System TZK2-D, an astrogeodetic state-of-the-art instrumentation developed at the University of Hannover. During 107 nights over a period of 3.5 years, the system was used for repeated vertical deflection observations at a selected station in
Hirt, Christian, Seeber, G.
exaly +3 more sources
Digital zenith camera accuracy analysis scheme based on digital image processing
Journal of Physics: Conference Series, 2020 Abstract This article uses a digital zenith camera to perform field measurements to obtain high-precision astronomical longitude and latitude data. To identify the photographed stellar markers, we utilize FFT and digital image processing methods to do CCD star image matching, the establishment of a numerical fit model for star matching ...
Deguo Yang, Li Cui, Congxia Liang
exaly +2 more sources
Let there be Skyglow—light pollution from a large outdoor music festival (Lollapalooza Berlin 2016) [PDF]
Scientific ReportsLive music is often linked to elaborate light shows, particularly at large outdoor music festivals. However, artificial light at night is one form of environmental pollution, light pollution, and because outdoor festivals emit a substantial amount of ...
Andreas Jechow
doaj +2 more sources