This dataset belongs to the publication "Absolute vertical motion of the Amsterdam Ordnance Date (NAP)" (https://doi.org/10.5194/piahs-97-1-2020) on the occasion of the Tenth International Symposium on Land Subsidence (TISOLS ) held in Delft, the Netherlands, 2024 April 2020.

This dataset consists of 5 files, namely: Westerbork.dat, Radio_Kootwijk_new.dat, Radio_Kootwijk_SM.dat, Zundert.dat and Epen.dat. The files contain measured absolute gravity data sorted by time (years) with the associated instrumental offset and uncertainty, obtained from the attended comparison campaigns. This is followed by the measurement accuracy from the direct gravity measurements. All in microGal (10^-8 m/s^2). The data set is concluded with the measured groundwater levels (in cm) in the last column.

An exception to the above is Radio_Kootwijk_SM.dat. This file also contains data from soil moisture measurements. The data describes the total summation of soil moisture from ground surface to groundwater level. The total summation here has been converted to microGal. The Bouguer plate model approach has been applied for this.