engleski

Establishment of gravimetric network for the area of Zagreb metro

The paper offers the overview of the establishment of gravimetric network on the wider area of the City of Zagreb, the capitol of the Republic of Croatia. The network consists of 34 points the stabilization of which has been taken over from the previously established fundamental GPS network of the City of Zagreb. There is also the implementation of precise GPS, leveling and relative gravimetric measurements presented. In gravimetric measurements the relative gravimeter Scintrex Autograv CG-5 has been used. For the purpose of defining gravimetric datum two absolute gravimetric points were used. The relative gravimeter was calibrated on the part of the Gravimetric calibration base of the Republic of Croatia before and after the measurement. In the process of adjusting the gravimetric network, the input values were absolute values of gravity and gravity differences between the points that had been previously corrected for the height of instrument, the change of Earth pole position and for the air pressure, as well as for the instrumental drift. Standard deviations of gravity differences and the distance between points were used for weights. The obtained results of the gravity value, as well as their accuracy estimation indicate that there was extremely reliable gravimetric network established using applied methodology.

gravity; network; gravimeter drift; linear; quadratic

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