Long-Range Geoid Testing by GPS-Leveling Data in Turkey
Publication: Journal of Surveying Engineering
Volume 132, Issue 1
Abstract
A long-range geoid testing procedure is presented using a geometrical geoid profile, which extends in an approximate north–south direction between the Mediterranean and the Black Sea. Along the first-order leveling line of the Turkish National Vertical Control Network (TNVCN), 47 leveling benchmarks at intervals were selected as global positioning satellite (GPS)-leveling control points with known Helmert orthometric heights. The geometrical geoid profile computed from GPS-leveling data was compared with the national Turkish Geoids 1991 (TG91) and 1999A (TG99A), and global geoids OSU91A and EGM96. In absolute geoid testing, it is verified that TG91 has a tilt and bias with respect to the GPS-leveling geoid. TG99A, which has no tilt and bias, displays the root mean square agreement of in the north–south direction. In relative geoid testing, it is understood that TG91 can only be used at or shorter baseline lengths, whereas TG99A can be used over all baseline lengths with an accuracy that is equal to the tolerance value for the second-order leveling control.
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Acknowledgments
This research was supported financially by the Research Found of Yildiz Technical University Project No. UNSPECIFIED20-11-01-01. The Helmert orthometric heights and geoid heights were provided by the General Command of Mapping. The writers thank C. Demir, A. Kilicoglu, M. Berber, N. Arslan, C. Aydin, U. Dogan,O. Bildirici, F. Uysal, and H. Alban for their contributions, and also the responsible editor for editing the text.
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Published In
Journal of Surveying Engineering
Volume 132 • Issue 1 • February 2006
Pages: 15 - 23
Copyright
© 2006 ASCE.
History
Received: May 28, 2003
Accepted: Mar 1, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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