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Integration of tree allometry rules to treetops detection and tree crowns delineation using airborne lidar data

Ivan Sačkov (1)   , Tomáš Hlásny (1-2), Tomáš Bucha (1), Miroslav Juriš (3)

iForest - Biogeosciences and Forestry, Volume 10, Issue 2, Pages 459-467 (2017)
doi: https://doi.org/10.3832/ifor2093-010
Published: Apr 04, 2017 - Copyright © 2017 SISEF

Research Articles


Airborne laser scanning (ALS) has recently gained increasing attention in forestry, as ALS data may facilitate the efficient assessment of forest inventory attributes and ecological indicators related to forest stand structure. This paper presents a novel workflow for individual tree detection and tree crown delineation using ALS data. The developed point-based approach included several tree allometry rules on permissible tree heights and crown dimensions to increase the likelihood of detecting the actual tree profiles. The accuracy of the method was assessed in a heterogeneous forest with a complex stand structure in Slovakia (Central Europe). ALS measurements were taken using a RIEGL Q680i scanner at 700 m of height with a point density of 20 echoes per m2. The ground reference data included the measured positions and dimensions of 1332 trees in nine plots distributed across the region. We found that the number of individual trees detected by the algorithm using ALS data was systematically underestimated by 34 ± 15% relative to the reference data. The delineated crown coverage was underestimated by 2 ± 6% as well, but the latter difference was not statistically significant (p>0.05).

  Keywords


Tree Allometry, Airborne Laser Scanning, Individual Tree Detection, Point-based Approach

Authors’ address

(1)
Ivan Sačkov
Tomáš Hlásny
Tomáš Bucha
National Forest Centre - Forest Research Institute Zvolen, T. G. Masaryka 22, Zvolen, 960 92 (Slovakia)
(2)
Tomáš Hlásny
Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Kamýcká 129, 165 21 Prague 6 (Czech Republic)
(3)
Miroslav Juriš
National Forest Centre - Institute for Forest Resources and Information Zvolen, Sokolská 2, Zvolen, 960 52 (Slovakia)

Corresponding author

 
Ivan Sačkov
sackov@nlcsk.org

Citation

Sačkov I, Hlásny T, Bucha T, Juriš M (2017). Integration of tree allometry rules to treetops detection and tree crowns delineation using airborne lidar data. iForest 10: 459-467. - doi: 10.3832/ifor2093-010

Academic Editor

Davide Travaglini

Paper history

Received: Apr 25, 2016
Accepted: Jan 16, 2017

First online: Apr 04, 2017
Publication Date: Apr 30, 2017
Publication Time: 2.60 months

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