Abstract
The results of building a local quasigeoid model by various methods on the territory of the geodesic training ground of SSUGT, based on the data of geometric leveling, GNSS measurements, gravimetry and astronomical measurements, are presented. The advantages of using a two-dimensional model of a quasigeoid in ellipsoidal coordinates over the "flat model" of height calibration widely used in GNSS technologies are shown. The criteria for choosing a method for building a quasigeoid model on a local territory and criteria for evaluating the quality of the results are determined. The results of determining the deviations of the vertical line in a given area, with control according to astronomo-geodesic measurements, are presented. In particular, a method for quick determining the deviations of a vertical line from the differences in astronomical and geodetic zenith distances was tested. A conclusion about the best method for determining the parameters of the local model of the quasigeoid and the deviations of the vertical line for a given territory is made. The results of the research are of practical significance for the training of students and specialists in the field of geodesy.
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