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GPS RTK method has never achieved millimetre vertical accuracy. For the most common geodetic tasks such as surveying, staking out and monitoring, GPS RTK method in many cases has been limited by its measuring accuracy. Before the appearance of the new Topcon Lazer ZoneTM technology, we were able to achieve centimetre vertical accuracy (from 1 to 3 centimetre) using GPS RTK systems. Combining Topcon Lazer ZoneTM technology and Topcon GPS RTK HiPer Pro system accuracy of height determination can be increased to a mi...

Underground exploitation of coal deposits in Karvinа region results in movements and deformations on the surface where a subsidence depression starts to create. The extraction activity under non-trivial geological and geo-mechanical conditions may cause unexpected time-spatial surface changes and different shape and range of creating subsidence depression. To observe the surface changes caused by underground mining in such area we decided to build up an observation station of points that are repeatedly surveyed by...