Concrete surface evaluation based on the reflected TLS laser beam’s intensity image classification

• Autorzy: Zaczek-Peplinska J. , Osińska-Skotak K.

Identyfikatory

DOI

10.2478/sgem-2018-0008

• Języki publikacji: EN

Abstrakty

EN

Dynamically developing terrestrial laser scanning technology (TLS) provides modern surveying tools, that is, scanning total stations and laser scanners. Owing to these instruments, periodic control surveys of concrete dams were performed as a part of geodetic monitoring yield point models characterised by quasicontinuity. Using the results of such measurements as a base, one can carry out a number of geometric analyses as well as acquire information for detailed analytical and calculative considerations. The scanner, similar to total station, by determining distances and angles, identifies spatial coordinates (X, Y, Z) of the surveyed points. Registration of the reflected laser beam’s intensity value (Intensity) emitted by the scanner provides additional information on the surveyed object. Owing to high working speed and the large amount of the collected data, the scanners became an indispensable tool for geodesists. The article assesses the possibility of application of terrestrial laser scanning in surveying changes in the surface of a concrete dam based on the experimental measurements. The condition of the dam’s downstream concrete wall was evaluated. The evaluation included changes in the surface’s roughness, cracks, seepage points, erosion caused by plant overgrowth and the degressive durability parameter of the used material (concrete). The article presents an example of the application of the results of a laser scan in the assessment of the condition of a water dam’s external concrete surfaces. The results of experimental measurements were analysed – the results of a scan of the downstream concrete wall of a dam in Ecker (Germany) using two laser scanners characterised by different technical parameters, that is, laser wavelength (laser’s colour), range, definable point density, method of distance measurement – Leica C10, Z+F Imager 5006h. The measurement was carried out in the same weather conditions from the same sites of the test base. The results of the measurements were analysed using, inter alia, statistical methods by defining template fields and supervised and unsupervised classification methods in reference to the selected fragments of the Surface characterised by known concrete surface properties. Various classification algorithms were used. The obtained results make it possible to assess the suitability of the proposed methodology of evaluating the concreto surface’s condition and establish tool selection principles to match the practical application requirements.

Słowa kluczowe

EN

engineering geodesy; Automatic Image Analysis; control of dams; assesment of concrete surface

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2018
• Tom: Vol. 40, nr 1
• Strony: 56--64
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Zaczek-Peplinska J.

• Warsaw University of Technology, Faculty of Geodesy and Cartography, Chair of Surveying Engineering and Measuring and Control Systems

autor

Osińska-Skotak K.

• Warsaw University of Technology, Faculty of Geodesy and Cartography, Unit of Photogrammetry, Remote Sensing and Spatial Information Systems

Bibliografia

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• [4] Hancock C. M., Roberts G. W., Bisby L., Cullen M., Arbuckle J. (2012): Detecting Fire Damaged Concrete Using Laser Scanning. Proceedings of FIG Working Week 2012, Roma, www.fig.net.
• [5] Jensen J.R. (1996): Introductory Digital Image Processing - A Remote Sensing Perspective, Prentice Hall, Upper Saddle River, New Jersey, second edition, 1996.
• [6] Liu W., Hung Ch.-Ch., Kuo B.-Ch., Coleman T. (2008): An adaptive clustering algorithm based on the possibility clustering and ISODATA for multispectral image classification, The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B7. Beijing, 2008.
• [7] Monserrat, O., Crosetto, M. (2008): Deformation measurement using terrestrial laser scanning data and least squares 3D surface matching. ISPRS Journal of Photogrammetry and Remote Sensing, 63(1), 142-154.
• [8] Popielski P., Zaczek-Peplinska J. (2013): Utilisation of terrestrial laser scanning for verification of geometry of numerical models of hydrotechnical structures using the example of a section of the concrete Besko dam. Technical Transactions, series Environmental Engineering, Cracow University of Technology Press, 2013, no. 1-Ś, 2013, 153-164.
• [9] Tou J. T., Gonzales R. C. (1974): Pattern Recognition Principles. Reading, Massachusetts: Addison-Wesley Publishing Company, 1974.
• [10] Zaczek-Peplinska J., Adamek A., Osińska-Skotak K., Adamek A. (2013): Inwentaryzacja galerii kontrolnej przelewu zapory ziemnej Klimkówka metodą skanowania laserowego/Inventory of the control gallery and overflow section of Klimkówka earthfill dam using laser scanning in: Measurement technologies in surveying. Geodezyjne technologie pomiarowe, 2013, ISBN 978-83-61576-26-7, 147-163.
• [11] Zaczek-Peplinska J., Osińska-Skotak K., Gergont K. (2012): Możliwości wykorzystania zmian intensywności odbicia promienia laserowego do oceny stanu konstrukcji betonowej. Monografia „Inżynieryjne zastosowania geodezji”, Wydawnictwo Politechniki Poznańskiej, Poznań, 2012, ISBN 978-83-7775-204-3, 41-54.
• [12] Zaczek-Peplinska J., Osińska-Skotak K. (2013): Możliwości wykorzystania intensywności odbicia laserowego do oceny stanu powierzchni betonowego obiektu hydrotechnicznego/Opportunities for utilisation of laser beam reflection intesity value for the concrete hydrotechnical object surface conditio assesment, in: Zapory: bezpieczeństwo i kierunki rozwoju / Winter Jan, Kosik Anna, Wita Andrzej ( red. ), Monografie Instytutu Meteorologii i Gospodarki Wodnej, 2013, Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy, ISBN 9788361102816, p. 204-217.
• [13] Zaczek-Peplinska J., Falaciński P. (2011): Evaluation of possibilities to apply laser scanning for estimation of conditions of concrete. Reports on Geodesy, No. 1 (91)/2011, ss.: 539-546;

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).