Volumetric performance evaluation of a laser scanner based on geometric error model
Bala MuralikrishnanMassimiliano FerrucciDaniel SawyerGrant GernerV. LeeChristopher J. BlackburnSteven PhillipsП. П. ПетровYuri YakovlevAndrey AstrelinSpike MilliganJohn Palmateer
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Keywords:
Laser Scanning
Identification
Geometric Modeling
Prism
Multiple laser scanner hardware configurations can be applied to Mobile Mapping Systems. As best practice, laser scanners are rotated horizontally or inclined vertically to increase the probability of contact between the laser scan plane and any surfaces that are perpendicular to the direction of travel. Vertical inclinations also maximise the number of scan profiles striking narrow vertical features, something that can be of use when trying to recognise features. Adding a second scanner allows an MMS to capture more data and improve laser coverage of an area by filling in laser shadows. However, in any MMS the orientation of each scanner on the platform must be decided upon. Changes in the horizontal or vertical orientations of the scanner can increase the range to vertical targets and the road surface, with excessive scanner angles lowering point density significantly. Limited information is available to assist the manufacturers or operators in identifying the optimal scanner orientation for roadside surveys. The method proposed in this paper applies 3D surface normals and geometric formulae to assess the influence of scanner orientation on point distribution. It was demonstrated that by changing the orientation of the scanner the number of pulses striking a target could be greatly increased, and the number of profiles intersecting with the target could also be increased—something that is particularly important for narrow vertical features. The importance of identifying the correct trade-off between the number of profiles intersecting with the target and the point spacing was also raised.
Laser Scanning
Horizontal plane
Mobile mapping
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Most structures experience deterioration after construction. A routine inspection and maintenance must be accomplished for the efficient use of the structures. The routine inspection will play a major role on the determination of maintenance period and method. This study aims development of an automated tunnel inspection system based upon a 3 dimensional laser scanner. As for the initial stage of the project, a prototype tunnel scanner has been developed. The development of a tunnel scanner prototype follows comparison between image scanning and laser scanning system and investigation on the applicability and adaptivity of the scanners to the railway tunnel scanner. The applicability of the laser scanner on the railway tunnel has been confirmed from the pilot test by using commercialized general purpose close range laser scanner and applicability of a laser scanner as a railway tunnel scanner has been checked. From the result, a prototype of railway tunnel scanner has been built and the calibration of the system was carried out. Finally the developed tunnel laser scanner has been applied to different shapes and sizes of tunnels in use.
Laser Scanning
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To analyze the precision of 3Dlaser scanner in building modeling,this paper focused on the traditional modeling methods,a construction was scanned by 3Dlaser scanner technology.Through the data acquisition and analysis as well as process of3 Dsurface modeling,the technology of 3Dlaser scanner was compared with the traditional modeling methods,and the precision and reliability of the model was analyzed.The results showed that the accuracy of data obtaining from 3Dlaser scanner conformed to the expected requirements.And the 3Dlaser scanner can greatly save the time of modeling.Those highlighted the technology advantages of the 3Dlaser scanning,as well as a scientific reference which was provided for the application of 3Dlaser scanning technology in other fields.
Laser Scanning
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