PREPARING THE GRAVIMETRIC BASE TO CREATE A GEOID MODEL OF KAZAKHSTAN

Abstract

The regional geoid model will allow solving a number of scientific and practical problems, and will also promote the widespread use of cost-effective GNSS measurements to replace labor-intensive and expensive leveling work when determining the heights of points. The gravimetric basis of the geoid model is created in the form of a gravity anomaly map. The current gravimetric maps of Kazakhstan began to be created in the early 70s of the last century and were completed in 2001, providing the entire territory of the country with a gravimetric basis. However, today, taking into account the growth and development of science and technology, the requirements for the accuracy and detail of gravimetric data have increased. In this regard, the task arises of creating a new up-to-date gravimetric map of Kazakhstan, which will be used to solve a wide range of scientific and technical problems, including the creation of a new geoid model of Kazakhstan. The article discusses modern methods for creating gravimetric maps and examples of foreign experience. The stages of creating a new map of gravity anomalies in Bouguer reductions for Kazakhstan are described. The process of creating a unified database in ArcGIS software, with spatial reference in the WGS 1984 coordinate system and the Baltic height system, is reported. The new gravimetric map of Kazakhstan will be used to study the dynamics of changes in the country’s gravitational field, study the deep structure of the Earth, study tectonic activity on the territory of the republic, as well as for geodynamic studies in the territories of mineral deposits.