Extraction of crown radius and development of crown profile model of Pinus koraiensis based on TLS

WANG Fan, JIA Weiwei, TANG Yiren, LI Dandan

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1) : 13-22.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1) : 13-22. DOI: 10.12302/j.issn.1000-2006.202105050

Extraction of crown radius and development of crown profile model of Pinus koraiensis based on TLS

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Abstract

【Objective】 The aim of this research was to explore the accuracy of extracting the maximum crown radius (CR, RC) at different crown depths of Pinus koraiensis based on Terrestrial Laser Scanning (TLS) point cloud data and developing a crown profile model based on TLS point cloud data. This study provides a practical basis for researching tree crown structures based on the TLS point cloud data. 【Method】 The TLS point cloud data and the branch factor data measured were from 30 analytic Pinus koraiensis. The CR at different heights was extracted by layered projection of the point cloud data and then compared with field-measured data of 30 analytic P. koraiensis trees for precision analysis. Finally, the RC extracted from the point cloud data was used to develop a crown profile model of P. koraiensis. 【Result】The total extraction accuracy of the maximum RC was 86.17%. There were differences in the accuracy of radius extraction for different crown depths. The range of relative crown depths with the best extraction effect was 0.15-1.00, and the accuracy of RC extraction within this range was approximately 90%. The range of relative crown depth with the worst extraction effect was 0-0.15, and the extraction accuracy within this range was 60.27%-75.79%. The three selected equations (mischerlich equation, quadratic parabolic equation, 3-parameter Weibull function) had good fitting effects and the 3-parameter Weibull function was the optimal model. We re-parameterized the optimal model and added DBH and ratio of height to diameter (HD) to the model, and the goodness-of-fit of the model was significantly improved. 【Conclusion】 Based on the TLS point cloud data, the accuracy of the maximum RC extraction using the point cloud layered projection method satisfies the requirements of model development. Therefore, TLS data can be used to approximately replace field-measured data in crown profile model research.

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Terrestrial Leaser Scanning (TLS) / point cloud data / crown radius / crown profile model / Pinus koraiensis

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WANG Fan , JIA Weiwei , TANG Yiren , et al. Extraction of crown radius and development of crown profile model of Pinus koraiensis based on TLS[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2023, 47(1): 13-22 https://doi.org/10.12302/j.issn.1000-2006.202105050

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