An efficient method for the continuous extraction of subway tunnel cross sections using terrestrial point clouds is proposed. First. the continuous central axis of the tunnel is extracted using a 2D projection of the point cloud and curve fitting using the RANSAC (RANdom SAmple Consensus) algorithm. and the axis is optimized using a global extraction strategy based on segment-wise fit... https://www.royaltyfurnitureandappliancers.shop/product-category/upholstered-headboards/