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Turkish Fundamental Gravity Network (TTGA)
First Turkish gravity network (Turkish Fundamental Gravity Network 1956 - TTGA 56) consisting of 24 gravity points was established in 1956 by General Command of Mapping with accuracies of ranging between ± 0.07-0.19 mGal. Considering that these accuracies of point gravity values do not meet requirements of geodetic, geophysical, geodynamical and engineering purposes, the Turkish Fundamental Gravity Network - 1999 (TFGN-99) was established between 1993 and 1999. In 1993, a calibration line was established between Ankara and Konya consisting of 10 calibration points. TFGN-99 consists of 68 stations of which first order and absolute gravity stations are 55 and 13 respectively. 132 gravity connections, between the 55 first order and 13 absolute gravity stations, were measured, in so called go-back way, by two LaCoste & Romberg gravity meters (G-347, G-379) simultaneously, provided by General Command of Mapping (GCM) and General Directorate of Mineral Research and Exploration (MRE). FG-5 (101) absolute gravity meter was used for absolute gravity measurements provided by German Cartography and Geodesy Institution (BKG) in 1996.
Gravity measurements for a new gravity network have started in 2011 and will last approximately two years. Gravity points will be placed at 1 deg x 1 deg grid corners and the network will include existing TTGA-99 points.