Dr. Rudolf Urban Profile

Dr. Rudolf Urban

at Czech Technical Univ in Prague

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Publications (3)

Proceedings Article | 26 August 2020 Paper

Verification of UAS photogrammetry approach for mass movement monitoring in alpine terrain: a case study in High Tatras, Slovakia

Peter Blišt'an, Ľudovit Kovanič, Rudolf Urban, Martin Štroner, Zuzana Homolová

Proceedings Volume 11524, 115241Y (2020) https://doi.org/10.1117/12.2571169

KEYWORDS: Clouds, Geodesy, Atomic force microscopy, Photogrammetry, 3D scanning, Vegetation, Distance measurement, Laser scanners, Scanners, 3D metrology

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Proceedings Article | 22 June 2015 Paper

Special electronic distance meter calibration for precise engineering surveying industrial applications

Jaroslav Braun, Martin Štroner, Rudolf Urban

Proceedings Volume 9525, 95252O (2015) https://doi.org/10.1117/12.2184432

KEYWORDS: Distance measurement, Calibration, Error analysis, Geodesy, Civil engineering, Interferometers, Precision calibration, Prisms, Standards development, Interferometry

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All surveying instruments and their measurements suffer from some errors. To refine the measurement results, it is necessary to use procedures restricting influence of the instrument errors on the measured values or to implement numerical corrections. In precise engineering surveying industrial applications the accuracy of the distances usually realized on relatively short distance is a key parameter limiting the resulting accuracy of the determined values (coordinates, etc.).

To determine the size of systematic and random errors of the measured distances were made test with the idea of the suppression of the random error by the averaging of the repeating measurement, and reducing systematic errors influence of by identifying their absolute size on the absolute baseline realized in geodetic laboratory at the Faculty of Civil Engineering CTU in Prague. The 16 concrete pillars with forced centerings were set up and the absolute distances between the points were determined with a standard deviation of 0.02 millimetre using a Leica Absolute Tracker AT401.

For any distance measured by the calibrated instruments (up to the length of the testing baseline, i.e. 38.6 m) can now be determined the size of error correction of the distance meter in two ways: Firstly by the interpolation on the raw data, or secondly using correction function derived by previous FFT transformation usage.

The quality of this calibration and correction procedure was tested on three instruments (Trimble S6 HP, Topcon GPT-7501, Trimble M3) experimentally using Leica Absolute Tracker AT401.

By the correction procedure was the standard deviation of the measured distances reduced significantly to less than 0.6 mm. In case of Topcon GPT-7501 is the nominal standard deviation 2 mm, achieved (without corrections) 2.8 mm and after corrections 0.55 mm; in case of Trimble M3 is nominal standard deviation 3 mm, achieved (without corrections) 1.1 mm and after corrections 0.58 mm; and finally in case of Trimble S6 is nominal standard deviation 1 mm, achieved (without corrections) 1.2 mm and after corrections 0.51 mm.

Proposed procedure of the calibration and correction is in our opinion very suitable for increasing of the accuracy of the electronic distance measurement and allows the use of the common surveying instrument to achieve uncommonly high precision.

Proceedings Article | 21 June 2015 Paper

Precise deformation measurement of prestressed concrete beam during a strain test using the combination of intersection photogrammetry and micro-network measurement

Rudolf Urban, Jaroslav Braun, Martin Štroner

Proceedings Volume 9528, 95280X (2015) https://doi.org/10.1117/12.2184038

KEYWORDS: Photogrammetry, Geodesy, Neodymium, Cameras, Reflectivity, Ions, 3D modeling, Chemical elements, Bridges, Motion measurement

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