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A number of factors can significantly affect the accuracy of height determination when applying the GNSS leveling method. In general, it is possible to distinguish those related to the process of GNSS observations and their post-processing, and those related to the selection of the geoid/quasi-geoid height model. This work focuses on aspects of GNSS leveling accuracy when choosing global geoid models. In particular, to better ensure accuracy, it is important to understand the significance of the heights tidal system selection of global geoid models.

Purpose: estimation and evaluation of influence level of outer physical factors to observed gravity during gravitational monitoring execution at underground gas storages. Using of obtained results for quality increasing of final gravity data of gravitational monitoring for condition and exploitation of Dashava underground gas storage. Methodology: calculation of gravitational effects occurred by changes of survey conditions on the basis of experimental data about ground water level changing and atmospheric condition changing with using of known physical dependences.