Accuracy of Laser Scanners for Measuring Surfaces made of Synthetic Materials

Lenda, Grzegorz; Marmol, Urszula; Mirek, Grzegorz

doi:10.1127/pfg/2015/0273

Cited by 7 publications

(7 citation statements)

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“…Voegtle [47] investigated the influence of different materials on TLS measurement accuracy and proved that for surfaces of brighter colour (and consequently higher intensity) the geometric accuracy was about 3 times higher compared to black surfaces (of low intensity). Moreover, in the case of partially transparent materials and specular surfaces, the geometric accuracy decreases rapidly [47,[57][58][59][60].…”

Section: Terrestrial Laser Scanningmentioning

confidence: 99%

The Quality Assessment of Different Geolocalisation Methods for a Sensor System to Monitor Structural Health of Monumental Objects

Markiewicz

Łapiński

Kot

et al. 2020

Sensors

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Cultural heritage objects are affected by a wide range of factors causing their deterioration and decay over time such as ground deformations, changes in hydrographic conditions, vibrations or excess of moisture, which can cause scratches and cracks formation in the case of historic buildings. The electromagnetic spectroscopy has been widely used for non-destructive structural health monitoring of concrete structures. However, the limitation of this technology is a lack of geolocalisation in the space for multispectral architectural documentation. The aim of this study is to examine different geolocalisation methods in order to determine the position of the sensor system, which will then allow to georeference the results of measurements performed by this device and apply corrections to the sensor response, which is a crucial element required for further data processing related to the object structure and its features. The classical surveying, terrestrial laser scanning (TLS), and Structure-from-Motion (SfM) photogrammetry methods were used in this investigation at three test sites. The methods were reviewed and investigated. The results indicated that TLS technique should be applied for simple structures and plain textures, while the SfM technique should be used for marble-based and other translucent or semi-translucent structures in order to achieve the highest accuracy for geolocalisation of the proposed sensor system.

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Section: Terrestrial Laser Scanningmentioning

confidence: 99%

The Quality Assessment of Different Geolocalisation Methods for a Sensor System to Monitor Structural Health of Monumental Objects

Markiewicz

Łapiński

Kot

et al. 2020

Sensors

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“…The second, described in Chapter 6, is the refraction of light in the glass fiber layer, which changed length by a constant value. The authors conducted research related to changes in the measured length of the light scattering in surface structures (synthetic materials) [ 11 ]. Most synthetic materials cause changes in measured lengths and can be systematized.…”

Section: Laser Scanning Of the Outer Surface Of The Dome After Assmentioning

confidence: 99%

“…Different authors indicate deterioration of accuracy about values of a few to several dozen mm, depending on the material type [ 9 , 10 ]. In the paper [ 11 ], the influence of synthetics on scanning results was investigated and errors of up to several dozen mm were confirmed. These errors depend on the ability of the material to scatter the beam in its structure, conditioned by many factors.…”

Section: Introductionmentioning

confidence: 99%

Multi-Variant TLS and SfM Photogrammetric Measurements Affected by Different Factors for Determining the Surface Shape of a Thin-Walled Dome

Lenda

Siwiec

Kudrys

2020

Sensors

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The paper presents a combined analysis of terrestrial laser scanning (TLS) and structure from motion (SfM) photogrammetric measurement to determine an accurate model of the surface shape of a thin-walled dome. The analysis takes into account several factors that may affect the accuracy of measurement. In TLS measurements, these are related to scattering of the beam and its penetration into the structure of objects. Penetration of the beam into a synthetic structure changes the measured length. Shell moisture, caused by rainfall or dew effect, similarly affects the measured length, but the changes are dispersed. In the first case, it will change the size of the object, and in the second one, it generates measurement noise. SfM photogrammetric problems, such as object gloss and ambient reflection, lack of detail, and different results from software creating point clouds were also analyzed. An interesting observation was the significant influence of atmospheric pollution, sedimented on the lower half of the glossy dome, on increasing the accuracy of photogrammetric measurement. The analyses contain a number of cases that take into account the complex problems of obtaining and processing data of such facilities: periodic measurement, TLS and SfM photogrammetric measurement, measurement outside and inside the object, determination of the wall thickness, comparison with the project and free-sphere fitting, and use of dome rotation during TLS.

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“…Studies [4,19] suggestthat plastics have exhibited the largest standard deviations that are increasing with the distance from the scanner. The use of plastics not covered by the material impermeable to the laser beam has also been excluded by the study [13]. Spherical targets are usually made of polystyrene, plastic or paint-coated plastic.…”

Section: Fig 1location Of Targets For Inaccessible Terrain Between mentioning

confidence: 99%

Accuracy of Merging Point Clouds at the Maximum Range of a Scanner with Limited Possibilities of Target Placement

Lenda

Lewińska

Siwiec

2019

Archives of Civil Engineering

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The research was aimed at analysing the factors that affect the accuracy of merging point clouds when scanning over longer distances. Research takes into account the limited possibilities of target placement occurring while scanning opposite benches of quarries or open-pit mines, embankments from opposite banks of rivers etc. In all these cases, there is an obstacle/void between the scanner and measured object that prevents the optimal location of targets and enlarging scanning distances. The accuracy factors for cloud merging are: the placement of targets relative to the scanner and measured object, the target type and instrument range. Tests demonstrated that for scanning of objects with lower accuracy requirements, over long distances, it is optimal to choose flat targets for registration. For objects with higher accuracy requirements, scanned from shorter distances, it is worth selecting spherical targets. Targets and scanned object should be on the same side of the void.

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Accuracy of Laser Scanners for Measuring Surfaces made of Synthetic Materials

Cited by 7 publications

References 0 publications

The Quality Assessment of Different Geolocalisation Methods for a Sensor System to Monitor Structural Health of Monumental Objects

The Quality Assessment of Different Geolocalisation Methods for a Sensor System to Monitor Structural Health of Monumental Objects

Multi-Variant TLS and SfM Photogrammetric Measurements Affected by Different Factors for Determining the Surface Shape of a Thin-Walled Dome

Accuracy of Merging Point Clouds at the Maximum Range of a Scanner with Limited Possibilities of Target Placement

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