Comparison of Terrestrial Laser Scanning and X-ray Scanning in Measuring Scots Pine (Pinus sylvestris L.) Branch Structure

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Pyörälä , J , Kankare , V , Vastaranta , M , Rikala , J , Holopainen , M , Sipi , M , Hyyppä , J & Uusitalo , J 2018 , ' Comparison of Terrestrial Laser Scanning and X-ray Scanning in Measuring Scots Pine (Pinus sylvestris L.) Branch Structure ' , Scandinavian Journal of Forest Research , vol. 33 , no. 3 , pp. 291-298 . https://doi.org/10.1080/02827581.2017.1355409

Title: Comparison of Terrestrial Laser Scanning and X-ray Scanning in Measuring Scots Pine (Pinus sylvestris L.) Branch Structure
Author: Pyörälä, Jiri; Kankare, Ville; Vastaranta, Mikko; Rikala, Juha; Holopainen, Markus; Sipi, Marketta; Hyyppä, Juha; Uusitalo, Jori
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Marketta Sipi / Principal Investigator
Date: 2018
Language: eng
Number of pages: 8
Belongs to series: Scandinavian Journal of Forest Research
ISSN: 0282-7581
URI: http://hdl.handle.net/10138/233380
Abstract: While X-ray scanning is increasingly used to measure the interior quality of logs, terrestrial laser scanning (TLS) could be used to collect information on external tree characteristics. As branches are one key indicator of wood quality, we compared TLS and X-ray scanning data in deriving whorl locations and each whorl's maximum branch and knot diameters for 162 Scots pine (Pinus sylvestris L.) log sections. The mean number of identified whorls per tree was 37.25 and 22.93 using X-ray and TLS data, respectively. The lowest TLS-derived whorl in each sample tree was an average 5.56 m higher than that of the X-ray data. Whorl-to-whorl mean distances and the means of the maximum branch and knot diameters in a whorl measured for each sample tree using TLS and X-ray data had mean differences of -0.12 m and -6.5 mm, respectively. One of the most utilized wood quality indicators, tree-specific maximum knot diameter measured by X-ray, had no statistically significant difference to the tree-specific maximum branch diameter measured from the TLS point cloud. It appears challenging to directly derive comparative branch structure information using TLS and X-ray. However, some features that are extractable from TLS point clouds are potential wood quality indicators.
Subject: 4112 Forestry
Ground-based LiDAR
wood quality
knots
wood procurement
STANDING TREES
LOG SCANNER
CLEAR WOOD
STEM
TIMBER
QUALITY
LIDAR
RECONSTRUCTION
ATTRIBUTES
PREDICTION
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