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Measurements of horizontal and vertical displacements are carried out mostly based on
reference points identified as fixed. In surveying practice there may be some situations in
which there is not possible to perform the measurements with reference to stable points or the
difficulties in identification of pointsâ stability may arise. Accuracy analysis based on the
covariance matrices have a special role in this process. In presented paper the covariance
matrices were determined. The authors took advantage of the method of determination the
vertical displacements in the absence of stability of reference points. The paper presents
algorithm of computation and also results of the empirical tests. Tests were carried out based
on simulated data of foundation plate measurements. The conclusions, which came from the
calculations, encourage not only to do more detailed analysis and tests but also to theoretical
development of the presented method.
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