In Turkey the task of computing its national geoid is under the purview of Geodesy Department, a division under the General Command of Mapping. They have put up efforts publishing a number of geoid since mid-70's. The first Turkey geoid was determined in 1976 (Turkey Geoid 1976). It was determined using astrogeodetic method. Then in 1991 they came up with Turkish Geoid 1991 (TG-91) computed using LSC of the remove-restore method. In 1994 another new geoid was computed - Turkish Astrogeodetic Geoid 1994 (TAG-94). Another geoid computation up-dating effort was done in 1999 with the creation of updated Turkish Geoid (TG-99A). TG-99A was computed also by LSC approach. All publications describing about Turkey Geoid 1976, TG-91, TAG-94 and TG-99A were written in Tukish.
The most recent geoid of Turkey is Turkish Geoid 2009 (TG-09). It was also computed using LSC approach of remove-restore procedure. In addition to TG-09 a Turkish Hybrid Geoid Model 2009 (THG-09) was also created. THG-09 was computed using FFT technique using EGM08, DNSC08 sea gravity anomalies as well as terrestrial gravity data. The work on THG-09 was published in Studia Geophys Geodaetica (Kilicoglu et. al, 2011).
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