Calibration Method for IATS and Application in Multi-Target Monitoring Using Coded Targets

Zhou, Yufen; Wagner, Alfred; Wunderlich, Thomas; Wasmeier, Peter

doi:10.1515/jag-2016-0021

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…While dealing with such an instrument, its calibration is highly important. Calibration models for the on-board cameras are described in [ 12 , 17 , 18 ]. The calibration ensures the perfect coaxiality between the built-in camera and the telescope line of sight, so that the observed image corresponds to the targeted area containing the point to be measured.…”

Section: Modern Total Stations—state Of the Art And Case Studiesmentioning

confidence: 99%

Investigation of a Combined Surveying and Scanning Device: The Trimble SX10 Scanning Total Station

Lachat

Landes

Grussenmeyer

2017

Sensors

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Surveying fields from geosciences to infrastructure monitoring make use of a wide range of instruments for accurate 3D geometry acquisition. In many cases, the Terrestrial Laser Scanner (TLS) tends to become an optimal alternative to total station measurements thanks to the high point acquisition rate it offers, but also to ever deeper data processing software functionalities. Nevertheless, traditional surveying techniques are valuable in some kinds of projects. Nowadays, a few modern total stations combine their conventional capabilities with those of a laser scanner in a unique device. The recent Trimble SX10 scanning total station is a survey instrument merging high-speed 3D scanning and the capabilities of an image-assisted total station. In this paper this new instrument is introduced and first compared to state-of-the-art image-assisted total stations. The paper also addresses the topic of various laser scanning projects and the delivered point clouds are compared with those of other TLS. Directly and indirectly georeferenced projects have been carried out and are investigated in this paper, and a polygonal traverse is performed through a building. Comparisons with the results delivered by well-established survey instruments show the reliability of the Trimble SX10 for geodetic work as well as for scanning projects.

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Section: Modern Total Stations—state Of the Art And Case Studiesmentioning

confidence: 99%

Investigation of a Combined Surveying and Scanning Device: The Trimble SX10 Scanning Total Station

Lachat

Landes

Grussenmeyer

2017

Sensors

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“…In particular, robotic total stations (RTS), incorporating a high-precision rangefinder are used for the direct measurement of 3D coordinates of reflectors adopted as CPs. In modern instruments, an internal camera allows for image-based techniques to be exploited for target recognition and precise measurement [ 33 , 34 ], which makes the field operation independent from the operator’s capability and helps speed up data acquisition [ 35 ]. Instead of using them in geodetic networks to be periodically re-measured, one or more RTSs may be included into an automatic monitoring system because they allow very short-term repetition of measurements (up to a few tens of minutes, depending on how many CPs have to be targeted).…”

Section: Geodetic and Gnss Sensors For Precise Measurement At Specmentioning

confidence: 99%

Geodetic and Remote-Sensing Sensors for Dam Deformation Monitoring

Scaioni

Marsella

Crosetto

et al. 2018

Sensors

135

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In recent years, the measurement of dam displacements has benefited from a great improvement of existing technology, which has allowed a higher degree of automation. This has led to data collection with an improved temporal and spatial resolution. Robotic total stations and GNSS (Global Navigation Satellite System) techniques, often in an integrated manner, may provide efficient solutions for measuring 3D displacements on precise locations on the outer surfaces of dams. On the other hand, remote-sensing techniques, such as terrestrial laser scanning, ground-based SAR (synthetic aperture radar) and satellite differential interferometric SAR offer the chance to extend the observed region to a large portion of a structure and its surrounding areas, integrating the information that is usually provided in a limited number of in-situ control points. The design and implementation of integrated monitoring systems have been revealed as a strategic solution to analyze different situations in a spatial and temporal context. Research devoted to the optimization of data processing tools has evolved with the aim of improving the accuracy and reliability of the measured deformations. The analysis of the observed data for the interpretation and prediction of dam deformations under external loads has been largely investigated on the basis of purely statistical or deterministic methods. The latter may integrate observation from geodetic, remote-sensing and geotechnical/structural sensors with mechanical models of the dam structure. In this paper, a review of the available technologies for dam deformation monitoring is provided, including those sensors that are already applied in routinary operations and some experimental solutions. The aim was to support people who are working in this field to have a complete view of existing solutions, as well as to understand future directions and trends.

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“…By addressing the theoretical origins of different errors when working with an IATS, methods for calibration or correction were provided to make the telescope (on-axis) camera in IATS a highly accurate measurement sensor [26,27]. Optimal passive targets were designed and automatic target detection algorithms based on computer vision or photogrammetry under different environmental conditions were provided [28,29]. Displacements and vibrations monitoring using IATS had been investigated in laboratory and verified with real civil engineering structures [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Water level measurement for reservoir dams with robotic total station during displacements monitoring

Zhou,

Gao,

Xiao

et al. 2024

Eng. Res. Express

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This study proposes a novel method for water level measurement of reservoir dams by utilizing the image sensor of robotic total station rather than requiring a staff gauge during displacements monitoring. The robotic total station is first aimed at the waterline manually and an image is captured by the telescope coaxial camera to obtain the initial elevation and waterline equation. In the periodic measurement stage, the zenith angle of the telescope is adjusted according to the predicted result to take pictures, and the waterline is extracted based on the parameters of the initial waterline equation through image processing technologies. The waterline is verified, and the water level elevation is estimated then. Simulation and field test results show that waterline extraction error affects the accuracy of the proposed method most, and an accuracy of around 2 pixels can be achieved for the waterline extraction method. And a water level measurement result with centimeter-level accuracy at a distance of about 350m can be expected, which has engineering application prospect.

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Calibration Method for IATS and Application in Multi-Target Monitoring Using Coded Targets

Cited by 8 publications

References 9 publications

Investigation of a Combined Surveying and Scanning Device: The Trimble SX10 Scanning Total Station

Investigation of a Combined Surveying and Scanning Device: The Trimble SX10 Scanning Total Station

Geodetic and Remote-Sensing Sensors for Dam Deformation Monitoring

Water level measurement for reservoir dams with robotic total station during displacements monitoring

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