![]() ![]() These vectors reduce the number of misalignments to otherwise similar features, resulting in a more reliable and robust method. Performanceīy representing features in the natural environment as vectors, then bringing these into alignment and treating them as natural targets, pairs of overlapping scans can be quickly and reliably aligned. A detailed description of the method can be seen below. The advantage of the Vercator approach is that the process utilises natural features in the 3D environment as natural targets which are automatically recognised, their location and orientation determined, then represented by feature vectors. Typically there are 10’s of millions of natural targets in each scan compared to the 10’s of artificial targets or natural targets marked by eye in other approaches, resulting in fewer misalignments. ![]() In fact, such vectors are calculated and found at every point. In the approach adopted by Vercator vectors in overlapping scans are matched and brought into alignment, first to perform rotation alignment, and then translation alignment in the horizontal plane, followed by translation alignment in the vertical plane. However, the process of registering the point clouds produced from static terrestrial scanning to extract useful information is user-intensive and time-consuming. Laser scanning has become a powerful way of capturing 3D measured data about the built environment. The model may be compared to the original design and serves as a digital record of the asset at a given point in time. Following this, accurate measurements of the dimensions can be made on the recorded 3D datasets to enable 3D model extraction without having to return to the site and in significantly reduced times. In order to construct survey-grade 3D models of buildings, roads, railway stations, canals and other similar structures, the 3D environment must be fully recorded with accuracy. Produced by a UCL spin-out company, Correvate, it touches on the robust automatic registration and smart object recognition technology that the company is developing for downstream analysis. This article presents a ground-breaking approach to generating survey data for a BIM process offered by the Vercator toolkit. This allows the model to be extracted without returning to the site. 3D point cloud registration enables the 3D environment to be recorded with accuracy.
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