Digital astro-geodetic camera system for the measurement of the deflections of the vertical: tests and results |
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| Authors: | K Halicioglu R Deniz H Ozener |
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| Institution: | 1. Geodesy Department, Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey;2. Geomatics Engineering Department, Istanbul Technical University, Istanbul, Turkey |
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| Abstract: | This study introduces the new results of a novel low-cost digital zenith camera system operated in Turkey that uses astronomical and geodetic instrumentation. Currently, it is possible to determine deflections of the vertical (DoV) components by using a vast amount of information gathered from geo-referenced star images, tilt measurements, and Global Navigation Satellite System technology. This new design of an astro-geodetic camera system is used for calculating DoV components with 12 independent solutions on a test station in Istanbul, and additional observations were performed to investigate the external accuracy of the system on a test network. A specific leveling method is developed to align system toward the zenithal direction. The final results of the observations on a test station located in Istanbul indicate that the accuracy of the system is about ±0.19 arc-seconds in latitude and ±0.28 arc-seconds in longitude determination. The system has been further tested on a network with 4 control points that have averagely 20?km baselines. At the test network, the root mean square of the average value of the vertical deflections is calculated as ±0.36 arc-seconds. Furthermore, DoV components are compared with the values that are calculated using global geopotential models. |
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| Keywords: | Geodetic astronomy geoid digital zenith camera system |
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