Geodetic support of the Ternopil region

Abstract

A general analysis of the geodetic support of the territory of the Ternopil region has been carried out. It is noted that until 1939 the Ternopil region was part of Poland, therefore, all geodetic networks that existed on its territory at that time were created in accordance with the regulatory documents of this country. After the creation of the Ternopil region, the creation of geodetic networks on its territory began in accordance with the Regulations of 1939, and then with the Regulations of 1954–61. The modern SGS was created in accordance with the Regulations of 1998, which in 2013 were replaced by the Procedure for the Creation of the State Geodetic Network. A detailed description of each class is given. The total number of points of state geodetic networks (by class) that falls on the territory of the region, as well as the average density of points per 1 km2, has been calculated. It is concluded that it is necessary to thicken the GHS on the territory of the region. In 1998, the «Basic Provisions for the Establishment of the State Geodetic Net-work of Ukraine» were adopted, which in 2013 were replaced by a new normative document «Procedure for the Construction of the State Geodetic Network». According to these two normative documents, a modern DGM was created and modernized in the Ternopil region. The geodetic network of the 1st class has 17 geodetic points. It should be noted that the coordinates of all points were re-determined by satellite. The work was per-formed in 2005 by the Research Institute of Geodesy and Cartography. The mean square errors of the coordinates were: mx = 0.001‒0.004 m; my = 0.001‒0.004 m. The geodetic network of the 2nd class has 144 geodetic points. 31 geodetic points, the coordinates of which did not meet the requirements of regulatory documents, re-determined by satellite method. The works were performed in 2005-2017 by the Re-search Institute of Geodesy and Cartography. The mean square errors of the coordinates were: mx = 0.003‒0.025 m; my = 0.001‒0.017 m. Other geodetic points, the coordinates of which are determined by the linear-angular method, in different years, according to the Regulations of 1954-61, met the requirements of modern regulations, so their coordinates have not changed. The mean square errors of determining the coordinates of these points were: mx = 0.012‒0.039 m; my = 0.015‒0.035 m. As we can see, the root mean square errors of determining the coordinates of points of the 2nd class do not exceed the allowable (0.04–0.05 m for the satellite method; 0.04–0.05 m for the linear-angular method). The 3rd class geodetic network has 278 geodetic points. Of these, 63 points whose coordinates did not meet the requirements of regulatory documents, determined by the satellite method. The work on their determination was performed by the Re-search Institute of Geodesy and Cartography in 2007–2017. The mean square errors of coordinate determination were: mx = 0.001‒0.011 m; my = 0.001‒0.019 m. 215 geodetic points, the coordinates of which were determined by linear-angular construction in accordance with the Regulations of 1954-61 have not changed because they meet the requirements of regulations. Exceptions are 23 geodetic points, the mean square errors of which exceed the allowable norms, i.e. 0.05 m. The remaining points are determined with the following root mean square errors: mx = 0.011‒0.050 m; my = 0.009‒0.050 m. Keywords: state geodetic network, geodetic provision, geodetic network, geodetic network of thickening, astronomical and geodetic network, the average density of geodetic points, topographic maps and plans.