Consideration of heterogeneity of gravity fields in local high precision geodetic constructions

The influence of heterogeneity of the gravity field on measurement of elements of local geodetic constructions and methods for their examination was estimated. Local values of elements of the gravitational field, i.e., those caused by gravity anomalies in the immediate vicinity of the geodetic station are determined. It is also possible to obtain information on changes in these elements over comparatively short distances, characteristic for local high precision geodetic constructions. In the plains region with a quiet gravitational field, corrections for heterogeneities over distances of 5 to 100 m are comparable with the accuracy of the geodetic measurement. Computation of the precise values of the corrections at each station in the network requires calculation of the radius of the area of anomalies considered, calculation of the necessary density of survey in the immediate neighborhood of stations, and execution of a gravimetric survey. Variometric observations are used for consideration of heterogeneities in the gravity field.