Abstract
Monitoring, maintaining, and organizing power lines corridors are of great importance because they are a primary means to transfer generated electricity from power stations to surrounding areas. Mobile Terrestrial Laser Scanning (MTLS) systems have significant potential for efficiently creating a power line infrastructure inventory. In this paper, a novel algorithm is presented for automatically extracting utility poles and cables from MTLS point clouds in three consecutive phases of pre-processing, poles extraction, and cables extraction. In the pre-processing step, after dividing the MTLS data into several tiles or sections along the road and using trajectory data, noisy points and low-height points are eliminated from each section. Next, search areas containing lines are detected using a Hough Transform (HT) algorithm, and utility poles are identified based on horizontal and vertical density information. The search area for cables is estimated using a two-dimensional (2D) Delaunay Triangulation (DT) of the center points of the extracted poles as vertices. In each search area, high-density points are removed as non-cable points and utility cables are eventually extracted by fitting cable points to polynomial equations. The algorithm was tested on three different MTLS point clouds from a 1371 m urban road section, and a 2800 m and a 500 m non-urban road sections. Each of these datasets has unique challenges and was used to evaluate the efficiency of the proposed algorithm under different conditions. The algorithm was able to extract poles with average correctness of 100% (no false positives) and completeness of 97%. Similarly, average correctness and completeness of 100% and 95.6% were attained for cables, respectively. These detection levels show that the proposed method for power lines extraction from an MTLS point cloud is both reliable and feasible.
Zusammenfassung
Eine robuste und effiziente Methode zur Detektion von Stromleitungen in Punktwolken aus dem mobilen Laserscanning. Überwachung, Instandhaltung und Management von frei hängenden Stromleitungen sind von großer Bedeutung, da davon die Versorgung der Endverbraucher abhängt. Mobile terrestrische Laserscanner (MTLS) - Systeme haben ein erhebliches Potenzial für die effiziente Bestandsaufnahme der Stromleitungsinfrastruktur. In diesem Beitrag wird ein neuer Algorithmus für die automatische Extraktion von Strommasten und Kabeln aus MTLS-Punktwolken vorgestellt. Der Algorithmus arbeitet in drei Phasen, nämlich Vorverarbeitung, Extraktion der Masten und Extraktion der Kabel. In der Vorverarbeitung werden auf Grundlage der Tracking-Daten des Fahrzeugs die MTLS-Daten in Kacheln entlang des Fahrweges aufgeteilt und verrauschte und bodennahe Punkte gelöscht. Danach werden Linienstrukturen mittels der Hough-Transform (HT) gesucht und Strommasten basierend auf horizontalen und vertikalen Dichteinformationen identifiziert. Die Suchbereiche für die Kabel werden mit Hilfe einer zweidimensionalen (2D) Delaunay-Triangulation (DT) zwischen den schon extrahierten Strommasten festgelegt. In jedem Suchbereich werden Verdichtungen in der Punktwolke als "Nicht-Kabelpunkte" entfernt. Danach werden die linienhaften Strukturen als Polynome modelliert und aufgrund dessen die Kabel gefunden. Der Algorithmus wurde an zwei verschiedenen MTLS-Punktwolken getestet, und zwar an einem 2800 m langen städtischen Straßenabschnitt und einer 1371 m langen Landstraße. Jeder dieser Datensätze hatte seine besonderen Herausforderungen und wurde verwendet, um die Effizienz des vorgeschlagenen Algorithmus unter unterschiedlichen Bedingungen zu bewerten. Der Algorithmus konnte Strommasten mit einer durchschnittlichen Richtigkeit von 100% (keine False Positives) und Vollständigkeit von 97% extrahieren. Für Kabel galten die Werte 100% bzw. 95,6%. Die Ergebnisse zeigen, dass die vorgeschlagene Methode zur Extraktion von Stromleitungen aus einer MTLS-Punktwolke sowohl zuverlässig als auch praktisch einsetzbar arbeitet.
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Acknowledgements
Authors would like to thanks Prof. Haiyan Guan for sharing their MTLS dataset (Guan et al. 2016).
Funding
This research received no external funding, however, the original US datasets were collected as part of research sponsored by the South Carolina Department of Tranportation.
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Shokri, D., Rastiveis, H., Sarasua, W.A. et al. A Robust and Efficient Method for Power Lines Extraction from Mobile LiDAR Point Clouds. PFG 89, 209–232 (2021). https://doi.org/10.1007/s41064-021-00155-y
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DOI: https://doi.org/10.1007/s41064-021-00155-y