Accurate Extraction of Cableways Based on the LS-PCA Combination Analysis Method

Abstract

In order to maintain a ski resort efficiently, regular inspections of the cableways are essential. However, there are some difficulties in discovering and observing the cable car cableways in the ski resort. This paper proposes a high-precision segmentation and extraction method based on the 3D laser point cloud data collected by airborne lidar to address these problems. In this method, first, an elevation filtering algorithm is used to remove ground points and low-height vegetation, followed by preliminary segmentation of the cableway using the spatial distribution characteristics of the point cloud. The ropeway segmentation and extraction are then completed using the least squares-principal component combination analysis method for parameter fitting. Additionally, we selected three samples of data from the National Alpine Ski Center to be used as test objects. The real value is determined by the number of point clouds manually deducted by CloudCompare. The extraction accuracy is defined as the ratio of the number of point clouds extracted by the algorithm to the number of point clouds manually extracted. While the environmental complexities of the samples differ, the algorithm proposed in this paper is capable of segmenting and extracting cableways with great accuracy, achieving a comprehensive and effective extraction accuracy rate of 90.59%, which is sufficient to meet the project’s requirements.

3D Change Detection Method for Exterior Wall of LNG Storage Tank Supported by Multi‐Source Spatial Data

“…[25] LiDAR measures the angle and distance of reflection points by emitting a large number of laser pulses per second. [26] According to the different carrying platforms, LiDAR can be further divided into airborne laser scanning (ALS), [27,28] mobile laser scanning (MLS), [29,30] and terrestrial laser scanning (TLS). [31] Point clouds for SAR are typically produced using single-channel radargrammetric SAR, [32] multi-channel interferometric SAR, [33] multichannel tomographic SAR, [34] or persistent scatterer interferometry (PSI) using spaceborne or aerial platforms.…”