GPS heighting is considered as an alternative to classical terrestrial height measuring methods in present time. On ground of accuracy analysis of long term experimental measurements in a testing network and other localities the optimized measuring technology for GPS height differences determination was designed and successfully tested. A reduced observation scheme which can substitute the long sessions with mimimal losses of accuracy is presented together with some practical exemplifications. The technology was successfully applied in determination of detailed quasigeoidal section of 100 km length along the first order levelling lines in south-eastern Moravia. The technology was also tested in long term geodynamic monitoring of mountain areas.

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