FIG Peer Review Journal


Height System Modernization and Geoid Modelling Studies In Turkey (9254)

Irem Yakar (Turkey)
Irem Yakar
Istanbul Technical University
ITU Ayazağa Campus Ayşe Birkan Dormitory
Corresponding author Irem Yakar (email: iremyakar71[at], tel.: 05058986606)

[ abstract ] [ paper ] [ handouts ]

Published on the web n/a
Received 2017-10-08 / Accepted n/a
This paper is one of selection of papers published for the FIG Congress 2018 in Istanbul, Turkey and has undergone the FIG Peer Review Process.

FIG Congress 2018
ISBN n/a ISSN 2308-3441
URL n/a


HEIGHT SYSTEM MODERNIZATION AND GEOID MODELLING STUDIES IN TURKEY Irem YAKAR*,Bihter EROL* Istanbul Technical University, Geomatics Engineering Department 34469 Ayazaga, Istanbul, Turkey (yakari,bihter) KEYWORDS: Vertical Datum, Geoid Models,Height System Modernization,Vertical Geodetic Network ABSTRACT The establishment of vertical refence system in Turkey that is Turkish National Vertical Control Network(Türkiye Ulusal Düsey Kontrol Agı-TUDKA) started with the adjustment of observations at Antalya tide-gauge station between 1936-1971.In March 2012, official meeting of Turkey National Geodesy commision took place at Zonguldak Bulent Ecevit University .In the final decleration of the meeting, the problems with the levelling based vertical control approach which is currently using in the country and the realization of the vertical datum in Turkey have been discussed.A geoid model based definition which is more resistant to geodynamic activity,local crustal uplift or subsidence as well as the deterioration of the benchmarks is specified as main topic of the realization of new vertical datum. The problems in levelling based vertical control approach have led the country to find an alternative approach to vertical control.In this aspect,geoid based vertical datum approach is under consideration as an alternative way.Thus, the Realization of Turkish National Control Network Project(Türkiye Ulusal Yükseklik Sistemi Modernizasyonu) has inited by the General Command of Mapping.The aim of the project is obtaining a 1-2 cm accuracy geoid model that will be the new vertical datum of Turkey by using terrestrial and airborne gravity data which is obtained as a result of realization Project. The maximum achieved accuracy of the regional geoid models in Turkey is 8.7 cm but according to the Large Scale Map and Map Production Regulation(Büyük Olcekli Harita ve Harita Yapım Yönetmeligi) of Turkey ,the accuracy should be at least 5 cm so the result of the accuracy of the latest geoid model in Turkey is not satisfactory. Until reaching the aimed accuracy(1-2 cm accuracy regional geoid model),the local GPS/levelling surface models will be used as geodetic infrastructure in Turkey. The world goes through determining geoid models as vertical datums of their country .In this aspect,having an local geoid model which can meet the accuracy demands in Turkeis very important. In this study, historical perspective of Turkish vertical control approaches ,its current situation and current developments are aimed to specified.
Keywords: Positioning; Reference systems; Vertical Datum,Geoid Models,Height System Modernization,Vertical Geodetic Networks