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| Titel |
The integration of astro-geodetic data observed with ACSYS to the local geoid models Istanbul-Turkey |
| VerfasserIn |
Kerem Halicioglu, M. Tevfik Ozludemir, Rasim Deniz, Haluk Ozener, Muge Albayrak, Rasit Ulug, Burak Basoglu |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148785
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| Publikation (Nr.) |
 EGU/EGU2017-13072.pdf |
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| Zusammenfassung |
| Astro-geodetic deflections of the vertical components provide accurate and valuable
information of Earth’s gravity filed. Conventional methods require considerable effort and
time whereas new methods, namely digital zenith camera systems (DZCS), have been
designed to eliminate drawbacks of the conventional methods, such as observer dependent
errors, long observation times, and to improve the observation accuracy. The observation
principle is based on capturing star images near zenithal direction to determine astronomical
coordinates of the station point with the integration of CCD, telescope, tiltmeters, and GNSS
devices. In Turkey a new DZCS have been designed and tested on control network located in
Istanbul, of which the geoid height differences were known with the accuracy of ±3.5 cm.
Astro-geodetic Camera System (ACSYS) was used to determine the deflections of the
vertical components with an accuracy of ±0.1 − 0.3 arc seconds, and results were compared
with geoid height differences using astronomical levelling procedure. The results have
also been compared with the ones calculated from global geopotential models. In
this study the recent results of the first digital zenith camera system of Turkey are
presented and the future studies are introduced such as the current developments of the
system including hardware and software upgrades as well as the new observation
strategy of the ACSYS. We also discuss the contribution and integration of the
astro-geodetic deflections of the vertical components to the geoid determination studies
in the light of information of current ongoing projects being operated in Turkey. |
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