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The paper analyzes normal corrections for the determination of the normal height differences along the First Order Levelling lines in Bulgaria. Normal corrections are calculated in two ways – with measured gravity accelerations and with gravity data from Global Geopotential Models (GGM). The study uses the last contemporary GGMs developed up to 2160-2190 degree and ultra-high resolution GGMPlus model. Calculations for Bouguer anomalies are made by the calculation service in the International Centre for Global Eart...

Calculation of normal heights and differences from known geopotential numbers and differences in geodetic practice is required when performing independent calculations: for control of levelling network adjustment made with different type heights – normal and geopotential; when using optical clocks technology for geopotential difference determinations; when performing precise engineering and geodetic works. It is well known that between two height types - normal heights and geopotential numbers exists theoretical e...

The possibilities of using gravimetric data obtained from global geopotential models (GGM) for the territory of Bulgaria in the processing of precise levelling measurements for the determination of normal differences and geopotential differences are presented in the article. The researches were carried out on first order levelling lines of the State Levelling Network of the Republic of Bulgaria, situated in different topographic conditions, as well as in conditions of different anomalous gravitational field. The d...