Türkiye'deki Astro-Jeodezik uygulamalar için sayısal zenit kamera sistemi

Jeodezi ve Jeofizik alanlarında yerin gravite alanının belirlenmesi ile ilgili pek çok güncel çalışma bulunmaktadır. Potansiyeli, ortalama deniz yüzeyi potansiyeline yakın olan jeopotansiyel yüzey “geoit”, bir düşey datum olarak yükseklik sistemlerinin temelini oluşturur ve bu nedenle, koordinat transformasyonu, ölçülerin indirgenmesi, yoğunluk araştırmaları ve benzeri çalışmalarda özel bir öneme sahiptir. Bir santimetre geoidinin belirlenmesi ile ilgili çalışmalar devam etmektedir. Bir cm-geoidi GNSS’den Türkiye için TUSAGA-Aktif rasyonel yararlanmanın temel koşuludur. Bu çalışmada güncel astro-jeodezik gözlemlere ilişkin Avrupa genelinde devam eden çalışmalara yer verilmiştir. Bu çalışma ayrıca veri elde etme, ölçme ekipmanları ve değerlendirme yöntemleri ile gözlem esasları ve Jeodezik Astronomide yeni teknolojiler ile ilgili gelişmeleri içermektedir. Bu çalışmanın son kısmında ise İstanbul’da tasarlanan ve ilk test gözlemleri gerçekleştirilen Sayısal Zenit Kamera Sistemi tanıtılmaktadır

Digital zenith camera system for Astro-Geodetic applications in Turkey

There are several current investigations on gravity field of the earth in Geodesy and Geophysics. Earth sciences and space researches are also interested in gravity studies. Geoid, which approximately has an equal potential to the potential of mean sea level, is the main datum for height systems and is used for coordinate transformation, reduction of measurements, subsurface density variations and similar scientific studies. Current studies focus on the determination of cm level geoid, in order to use Global Navigation Satellite Systems GNSS such as Continuously Operating Reference Stations CORS-TR/TUSAGA-Active in Turkey effectively. This study introduces general information about recent astro-geodetic observations performed by different institutions all over Europe. Furthermore, it also gives some details about data acquisition, instrumentation and processing technique that focuses on observation principle and new technologies used in modern Geodetic Astronomy. Finally, this study introduces the system design and the first observations of a Digital Zenith Camera System DZCS used in Istanbul, Turkey

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  • Ayan T., (1976), Astrogeodatische Geoidberechnung für das Gebiet der Türkei, Doktora Tezi, Geodätisches Institut der Universität Fridericiana Karlsruhe, Almanya.
  • Ayhan M.E., Alp O., (1995), Türkiye Astro-jeodezik Jeoidi-1994 (TAG-94). Türk Haritacılığının 100. yılı TUJJB ve TUFUAB Kongresi Bildiriler Kitabı, Ankara, Türkiye, 307-320 ss.
  • Gerstbach G., (1996), How to get an European centimeter geoid (“astro-geological geoid”), Physics and Chemistry of the Earth, 21(4), 343-346.
  • Gessler J., (1975), Entwicklung und Erprobung einer transportablen Zenitkamera für astronomisch-geodätische Ortsbestimmungen. Wiss. Arb. Lehrst. für Geod., Phot. und Kart. Techn. Univ. Hannover Nr. 60, Almanya.
  • Halicioglu K., Ozener H., Deniz R., (2008), Current Geoid Studies in Turkey and the need for Local High-Precision Astrogeodetic Geoid Determination Using CCD/Zenith Cameras, American Geophysical Union, Fall Meeting 2008, San Francisco, CA, ABD
  • Halicioglu K., Deniz R., Ozener H., (2011), Astro-geodetic Measurements using Digital Zenith Camera System in IstanbulTurkey, EGU General Assembly Viyana, Avusturya.
  • Halicioglu K., Deniz R., Ozener H., (2012), Determination of AstroGeodetic Vertical Deflections using Digital Zenith Camera System in Istanbul, Proceedings FIG International Congress 2012, Roma, İtalya.
  • Hirt C., Bürki B., (2002), The Digital Zenith Camera - A New HighPrecision and Economic Astrogeodetic Observation System for Real-Time Measurement of Deflections of the Vertical, Proceeding of the 3rd Meeting of the International Gravity and Geoid Commission of the International Association of Geodesy, Selanik, Yunanistan.
  • Hirt C., Bürki, B., (2006), Status of geodetic astronomy at the beginning of the 21st century, Festschrift Univ.- Prof. Dr.-Ing. Prof. h.c. Günter Seeber anlässlich seines 65. Geburtstages und der Verabschiedung in den Ruhestand (Hirt C., Ed.), Wissenschaftliche Arbeiten der Fachrichtung Geodäsie und Geoinformatik an der Universität Hannover, Nr. 258, ss.81–99.
  • Hirt C., Seeber G., (2008), Accuracy Analysis of vertical deflection data observed with the Hannover Digital Zenith Camera System TZK2-D. Journal of Geodesy, 82(6), 347-356, DOI: 10.1007/s00190-007-0184-7
  • Hirt C., Bürki B., Guillaume S., Featherstone W., (2010), Digital Zenith Cameras – State-of-the-Art Astrogeodetic Technology for Australian Geodesy, Proceedings FIG International Congress 2010, Sydney, Avusturalya.
  • Jekeli C., (2012), Geometric Reference Systems in Geodesy, Ohio State University, Ohio, USA, 209ss.
  • Marti U., (2004). High Precision combined geoid determination in Switzerland, Proceedings IAG GGSM2004 Symposium, Porto, Portekiz.
  • Kudrys J. (2009), Automatic Determination of the Deflections of the Vertical – First Scientific Results, Acta Geodynamics et Geomaterialia 6(3), 233-238.
  • Ogrizovic V. (2009), A Construction of an Advanced Measuring System for Astro-geodetic Determinations, Publ. Astron. Obs., Belgrade No. 86, 145-150.
  • Seeber G., (2003), Satellite Geodesy, Walter de Gruyter, 2. bs., Berlin, Almanya, 589ss.
  • Smart W.M., (1971), Textbook on Spherical Astronomy, Cambridge University Press, Cambridge, Büyük Britanya, 430ss.
  • Smith D., Holmes S., Li X., Wang Y., Archer-Shee M., Singh A., Middleton C., Winester D., Roman D., Bürki B., Guillaume S., (2011), Initial Results of the Geoid Slope Validation Survey of 2011, American Geophysical Union Fall Meeting 2011 San Francisco, CA, ABD
  • TNUGG, (2011), Turkish National Union of Geodesy and Geophysics National Reports of Geodesy Commission of Turkey for 2007-2011, http://www.iag-aig.org/ attach/5015ba0f03bf732e1543f4120f15ec9a/turkey.pdf, [Erişim 12 Ekim 2012]