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NORMAL HEIGHT AND GEOPOTENTIAL NUMBER DIFFERENCES DETERMINATION FOR THE TERRITORY OF BULGARIA WITH USE OF DATA FROM GLOBAL GRAVITY FIELD MODELS
Abstract
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 data used for the calculation of the second normal correction and geopotential differences on the levelling lines are data from gravimetric measurements and interpolated gravimetric data for the Bouguer anomalies of EGM2008. Normal differences and geopotential differences were determined using different gravimetric data as well as data for benchmark heights from previous levelling measurements. The differences between the two types of height determinations based on conventional gravimetric data and GGM data are analyzed. The dependence of the series from the different physiographic conditions has been studied. The obtained results for differences on the levelling lines are compared with the regulatory requirements for accuracy in Bulgaria concerning the precise levelling determinations. The applications of gravimetric data from GGM are outlined both for precise height determinations and for detection of gross errors in precise levelling processing. The study for the territory of Bulgaria is based on an idea presented in the publication by Popadyev V. V., Gulyyev D. A. (2017) ?Application of global geopotential models to high- precision levelling processing?, where such studies were made to determine a normal correction on first-order levelling lines.
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