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Results of the Ground Surface Deformation Measurements in the Zone of Commencing the Roof Caving Exploitation and the Assessment of Its Impact on Buildings

Kapusta Ł., Szojda L.

Prace Instytutu Mechaniki Górotworu PAN

2018

T. 20, nr 2

123--135

The article presented the results of periodic geodetic measurements, which embraced both the land surface and buildings in the zone of commencing mining exploitation. Classical geodetic measurements (levelling and tachymetric) were carried out in order to determine the size and nature of the mining ground deformation, the pace of change and their impact on the existing building development. The final results of the surface deformation were also compared with the forecasts prepared by the mine. The measurements lasted 13 months. During that period 19 measurement cycles were performed.

Modernization of the method of line-line intersection using RTN GNSS technology for determining the position of corners of buildings

Krzyżek R.

Artificial Satellites : Journal of Planetary Geodesy

2015

Vol. 50, No. 1

41--57

Carrying out measurements of buildings with RTN GNSS technology in difficult environmental conditions appears to be a major challenge for many surveyors. Achieving the required accuracy of the position of a building structure is often a difficult, and sometimes even an impossible task to perform. This paper presents an innovative solution to increase the reliability of determining the coordinates of building corners, by modernizing the results obtained from the indirect method of measurement of line-line intersection by the socalled half-angle method. Generally speaking, the half-angle method is to verify the angular values in determined points (corners of buildings) from the method of intersection of the base point lines. Optimization of this method involves reducing deformation of a building, which has been determined in real time, taking into account only the classical method of line-line intersection. In order to obtain optimized measurement results, the conversion of the obtained results to the convergent values relative to the most probable coordinates is performed. Based on a detailed comparative and statistical analyses, it can be concluded that the modernized method of line intersection, employed in the RTN GNSS mode with the half-angle method, greatly improves the reliability of determining corners of buildings (X and Y coordinates), as well as provides an exact reflection of the geometric shape of a structure.