In the world of 3D scanning, the right scanner depends on the application, but also on the main goal of the people who will use it. Each method has its benefits but also its trade-offs. This paper aims at helping service providers and asset owners select the most suitable 3D scanner solution for their inspection needs. 3D scanners are differentiated according to one of their main features: the ...

When dealing with precision in tolerancing of assembly systems, the modelling complexity of the mechanism increases. At first, one can distinguish the 1D tolerancing approach that only concerns variations of dimension. Then, several models are defined to set 3D tolerances, considering that the form error is negligible compared to the orientational and translational variations. Finally, some app...

Rail surface defects such as the abrasion, scratch and peeling often cause damages to the train wheels and rail bearings. An efficient and accurate detection of rail defects is of vital importance for the safety of railway transportation. In the past few decades, automatic rail defect detection has been studied; however, most developed methods use optic-imaging techniques to collect the rail su...

At least two control points must be available in order to determine the position and orientation of a total station (TS). This paper analyses optimum horizontal location of TS with respect to the control points and gives an answer to question “What is the best location of total station with respect to the control points if the goal is to determine the coordinates of TS and detail points as prec...

Three-dimensional (3D) point analysis and visualization is one of the most effective methods of point cluster detection and segmentation in geospatial datasets. However, serious scattering and clotting characteristics interfere with the visual detection of 3D point clusters. To overcome this problem, this study proposes the use of 3D Voronoi diagrams to analyze and visualize 3D points instead o...

Airborne array tomographic synthetic aperture radar (TomoSAR) can acquire three-dimensional (3D) information of the observed scene in a single pass. In process airborne TomoSAR data imaging, due to disturbance factors such as inconsistent antenna patterns and baseline errors, there are spatially varying amplitude-phase inconsistency errors multi-channel Single-Look-Complex (SLC) images. The exi...

From 3D points We first detect 3D points that are on the floor, ceiling or walls, based on their positions and normals. A 3D point is detected to be on the floor if the point is at the floor height and its normal is along the up direction, allowing an error of 0.3m and 15 degrees, respectively. Points on the ceiling are detected in the same way. A 3D point belongs to a wall if its height is bet...

An investigation of the application of 1-m Ikonos satellite imagery to 3D point positioning and building reconstruction is reported. The focus of the evaluation of Geo panchromatic imagery has been upon 3D positioning accuracy, radiometric quality and attributes of the image data for building feature extraction. Following an initial review of characteristics of the Ikonos system, the multi-imag...