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| Titel |
Local Geoid Modelling using Astro-geodetic Camera System and GNSS/Leveling Data |
| VerfasserIn |
Kerem Halicioglu, Rasim Deniz, Haluk Ozener, M. Tevfik Ozludemir, Muge Albayrak |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127259
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| Publikation (Nr.) |
 EGU/EGU2016-7115.pdf |
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| Zusammenfassung |
| Geodetic astronomy provides regional and local interpretations of the gravity field of the
earth with deflections of the vertical components. Recently astro-geodetic data is used with
combination of leveling, GNSS, and gravity (aerial, terrestrial) observations for validation
purposes. Modern tools were developed in Europe and Asia as digital zenith camera systems
(DZCS) and now it is possible to determine precise deflections of the vertical data with an
accuracy of ±0.1 − 0.3 arc seconds. GNSS/Leveling geoid of Istanbul was modeled in 2005
with an accuracy of ±3.5 cm and needs to be improved using additional data such as
astro-geodetic deflections of the vertical. This study presents the recent observations
performed using DZCS of Turkey. The accuracy of the system was tested with
GNSS/Leveling geoid model and the results were compared with geoid height differences
and global geopotential models. We also introduce a new project that includes modernization
of current astro-geodetic camera system, and the observations that are planned on a
larger test network. In this respect, new observations are going to be performed
on a test network with 25 points using astro-geodetic data, and the geoid height
differences will be obtained in order to improve local geoid model of Istanbul. |
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