THE REDUCTION TASKS OF GEODETIC SUPPORT MODERNIZATION FOR THE REPUBLIC OF CÔTE D'IVOIRE
The article is devoted to the study of the so-called reduction tasks that may arise in the process of modernization of the national geodetic support system (on the example of the Republic of Côte d'Ivoire). This refers to the tasks of translating the results of geodetic measurements to a new reporting basis by obtaining and introducing corrections to geodetic data for changes in the coordinate system (heights) and the gravimetric system. A technique for solving problems of this kind is proposed, based on the results of the analysis of the current state of geodetic support in the Republic of Côte d'Ivoire. This technique includes calculation schemes for solving reduction problems of three types: for geodetic coordinates (transition to a new coordinate system); for geoid heights and deflections of vertical (transition to a new reference ellipsoid); for gravity anomalies (transition to a new gravimetric system, taking into account the possible modernization of the national system of heights). The general algorithm for reducing gravity anomalies generally takes into account three types of corrections, namely, for changing the accepted system of gravimetric measurements, the model of normal acceleration of gravity and the nominal values of the heights of gravimetric points. The description of the theoretical part of the methodology is supplemented by the results of a numerical study of reduction problems on the territory of the Republic of Côte d'Ivoire, containing quantitative estimates of the corresponding reduction corrections.