Abstract
Change detection and deformation monitoring is an active area of research within the field of engineering surveying and other overlapping areas such as structural and civil engineering. This paper reviews the application of terrestrial laser scanning in the monitoring of structures and discusses registration and georeferencing of scan data. Past terrestrial laser scanning research work has shown trends in addressing issues such as accurate registration and georeferencing of scans, error modelling, point cloud processing techniques for deformation analysis, scanner calibration and detection of millimetre deformations. However, several issues are still open to investigation such as robust methods of point cloud processing for detecting change and deformation, incorporation of measurement geometry in deformation measurements, design of data acquisition and quality assessment for precise measurements and modelling the environmental effects on the performance of laser scanning. A three-stage process model for deformation analysis is proposed as conceptualised from the material reviewed.
Highlights
Geodetic monitoring of structures is a common practice in the field of engineering surveying (Mechelke et al, 2013)
The need for accurate registration and georeferencing of Terrestrial Laser Scanning (TLS) data in change detection and deformation monitoring studies has been emphasised by many researchers
7.0 Conclusion Metrological monitoring of large structures such as bridges, tunnels, towers or dams is an important subject since such objects might cause an immense damage in case of a malfunction (Schneider, 2006) and the significance of monitoring structures is evident in several studies reviewed in this paper
Summary
Geodetic monitoring of structures is a common practice in the field of engineering surveying (Mechelke et al, 2013). Monitoring structural deformation is one of the major concerns when dealing with structures such as bridges, tunnels, dams and tall buildings (Han et al, 2013). These engineering structures are examples of structures that are routinely surveyed and monitored for their stability as they are subject to deformation due to factors such as changes of ground water level, tidal phenomena, tectonic phenomena, etc. Within the field of engineering surveying, especially in the area of deformation and displacement measurement of structures, traditional point-wise surveying methods are mostly used. Vertical displacements and elevations are measured by high precision levelling whilst the spatial displacements and movements are derived by total stations or theodolites (Lovas et al, 2008)
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