The files in the collection contain a 3D time-series of displacements in [m]. Data were collected before 1st GATHERS Summer School in Wrocław as a reference data. The observations were taken at the roof of Wrocław University of Environmental and Life Sciences - Institute of Geodesy and Geoinformatics: Location in Google Maps Please note that each file is containing 3 time-series in North, East and Up direction. There are three headers beginning each of the time-series. The GNSS_PPP.ascii contains the results of kinematic PPP (Precise Point Positioning) The GNSS_VAD.ascii contains the results of a kinematic variometric approach to GNSS data processing (from VADASE software). The ACC_DISPL.ascii contains the displacements calculated from accelerations measured with GeoTiny!AC accelerometer. The GNSS antenna and the accelerometer were co-located with a distance of 10 cm and rigidly connected. If some questions arise, please send a message to: jan.kaplon@upwr.edu.pl,