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The deformation monitoring of subway tunnel is of extraordinary necessity. Therefore, a method for deformation monitoring based\udon terrestrial point clouds is proposed in this paper. First, the traditional adjacent stations registration is replaced by sectioncontrolled\udregistration, so that the common control points can be used by each station and thus the error accumulation avoided\udwithin a section. Afterwards, the central axis of the subway tunnel is determined through RANSAC (Random Sample Consensus)\udalgorithm and curve fitting. Although with very high resolution, laser points are still discrete and thus the vertical section is\udcomputed via the quadric fitting of the vicinity of interest, instead of the fitting of the whole model of a subway tunnel, which is\uddetermined by the intersection line rotated about the central axis of tunnel within a vertical plane. The extraction of the vertical\udsection is then optimized using RANSAC for the purpose of filtering out noises. Based on the extracted vertical sections, the volume\udof tunnel deformation is estimated by the comparison between vertical sections extracted at the same position from different epochs\udof point clouds. Furthermore, the continuously extracted vertical sections are deployed to evaluate the convergent tendency of the\udtunnel. The proposed algorithms are verified using real datasets in terms of accuracy and computation efficiency. The experimental\udresult of fitting accuracy analysis shows the maximum deviation between interpolated point and real point is 1.5 mm, and the\udminimum one is 0.1 mm; the convergent tendency of the tunnel was detected by the comparison of adjacent fitting radius. The\udmaximum error is 6 mm, while the minimum one is 1 mm. The computation cost of vertical section abstraction is within 3\udseconds/section, which proves high efficiency.

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

CONTINUOUSLY DEFORMATION MONITORING OF SUBWAY TUNNEL BASED ON TERRESTRIAL POINT CLOUDS