TY - JOUR N2 - The problem of determining displacements of objects is an important and current issue, in particular in terms of operational safety. This is a requirement that covers geodetic, periodic control measurements in order to determine horizontal and vertical displacements. The paper is focused on the analysis of vertical displacements. Geodetic measurements and their interpretation allow to reduce the risk of possible structural catastrophes. The major research topic of the majority of available papers is displacement determination of individual controlled points, in a situation where there are identified as fixed reference points. There are cases making identification of such points difficult or impossible to use in displacement analysis. This paper addresses a rare case of determining vertical displacements in unstable reference systems. Due to the fact that most of the existing and known literature methods do not always bring satisfactory results, the paper propose a new method of vertical displacement determination in the absence of reference points in the local coordinate system. Practical considerations on simulated data show that the presented method performs the task correctly. L1 - http://czasopisma.pan.pl/Content/115120/PDF/20_Paper_751_do%20druku_B5_met.pdf L2 - http://czasopisma.pan.pl/Content/115120 IS - No 1 EP - 326 DO - 10.24425/ace.2020.131790 KW - vertical displacements KW - unstable reference system KW - a lack of reference points A1 - Filipiak-Kowszyk, D. A1 - KamiƄski, W. PB - WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES VL - Vol. 66 DA - 2020.03.30 T1 - Determination of Vertical Displacements in Relative Monitoring Networks SP - 309 UR - http://czasopisma.pan.pl/dlibra/publication/edition/115120 T2 - Archives of Civil Engineering ER -