Application of GPS technique for monitoring of copper basin area in Poland

The territory of the copper ore basin with an area of ​​about 800 square kilometers is located in the South-Western part of Poland. Intensive extraction of minerals leads to significant deformations on the surface of the basin. In 1993, the Institute of Geodesy and Photogrammetry established a GPS network for monitoring deformations. The lengths of the sides of the network range from several hundred meters to 42 km. During observations of the GPS campaign in October 1993, 6 GPS receivers Ashtech MD-XII were used. Observations were processed by GPPS version 5.0. As a result of the adjustment, the following parameters of errors ellipses (95X) were obtained for the points:
- the main semiaxis from 2.6 to 8.3 mm,
- the minimum semiaxis from 2.2 to 6.0 mm.
In order to further control the accuracy and reliability of measurements in the network, the results of GPS measurements and classical methods were compared. The difference between the coordinates of the selected points ranged from 1 to 3 mm. For the further study of deformations, periodic measurements are expected in this region.