Quantitative Assessment of Scots Pine (Pinus Sylvestris L.) Whorl Structure in a Forest Environment Using Terrestrial Laser Scanning

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Pyörälä , J , Liang , X , Vastaranta , M , Saarinen , N , Kankare , V , Wang , Y , Holopainen , M & Hyyppä , J 2018 , ' Quantitative Assessment of Scots Pine (Pinus Sylvestris L.) Whorl Structure in a Forest Environment Using Terrestrial Laser Scanning ' , IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing , vol. 11 , no. 10 , pp. 3598-3607 . https://doi.org/10.1109/JSTARS.2018.2819598

Title: Quantitative Assessment of Scots Pine (Pinus Sylvestris L.) Whorl Structure in a Forest Environment Using Terrestrial Laser Scanning
Author: Pyörälä, Jiri; Liang, Xinlian; Vastaranta, Mikko; Saarinen, Ninni; Kankare, Ville; Wang, Yunsheng; Holopainen, Markus; Hyyppä, Juha
Contributor: University of Helsinki, Finnish Geospatial Research Institute FGI
University of Helsinki, Laboratory of Forest Resources Management and Geo-information Science
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2018-10
Language: eng
Number of pages: 10
Belongs to series: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
ISSN: 1939-1404
URI: http://hdl.handle.net/10138/259417
Abstract: State-of-the-art technology available at sawmills enables measurements of whorl numbers and the maximum branch diameter for individual logs, but such information is currently unavailable at the wood procurement planning phase. The first step toward more detailed evaluation of standing timber is to introduce a method that produces similar wood quality indicators in standing forests as those currently used in sawmills. Our aim was to develop a quantitative method to detect and model branches from terrestrial laser scanning (TLS) point clouds data of trees in a forest environment. The test data were obtained from 158 Scots pines (Pinus sylvestris L.) in six mature forest stands. The method was evaluated for the accuracy of the following branch parameters: Number of whorls per tree and for every whorl, the maximum branch diameter and the branch insertion angle associated with it. The analysis concentrated on log-sections (stem diameter > 15 cm) where the branches most affect wood's value added. The quantitative whorl detection method had an accuracy of 69.9% and a 1.9% false positive rate. The estimates of the maximum branch diameters and the corresponding insertion angles for each whorl were underestimated by 0.34 cm (11.1%) and 0.67 degrees (1.0%), with a root-mean-squared error of 1.42 cm (46.0%) and 17.2 degrees (26.3%), respectively. Distance from the scanner, occlusion, and wind were the main external factors that affect the method's functionality. Thus, the completeness and point density of the data should be addressed when applying TLS point cloud based tree models to assess branch parameters.
Subject: Branch
forestry
LiDAR
modeling
wood procurement
wood quality
LUMBER GRADE
TREE MODELS
STEM
RECONSTRUCTIONS
INFORMATION
PREDICTION
ALGORITHM
DIAMETER
BRANCHES
SAWLOGS
4112 Forestry
222 Other engineering and technologies
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