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Article

Retrieval of Forest Structural Parameters from Terrestrial Laser Scanning: A Romanian Case Study

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Department of Forest Monitoring, “Marin Drăcea“ Romanian National Institute for Research and Development in Forestry, 128 Eroilor Blvd., 077190 Voluntari, Ilfov, Romania
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Department of Forest Engineering, Forest Management Planning and Terrestrial Measurements, Faculty of Silviculture and Forest Engineering, “Transilvania” University, 1 Ludwig van Beethoven Str., 500123 Braşov, Romania
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Department of Geology, Geography and Environment, University of Alcala, 2 C. Colegios, 28801 Alcala de Henares, Spain
*
Author to whom correspondence should be addressed.
Forests 2020, 11(4), 392; https://doi.org/10.3390/f11040392
Received: 24 February 2020 / Revised: 23 March 2020 / Accepted: 30 March 2020 / Published: 1 April 2020
(This article belongs to the Section Forest Inventory, Modeling and Remote Sensing)
Research Highlights: The present study case investigates the differences occurring when tree’s biophysical parameters are extracted through single and multiple scans. Scan sessions covered mountainous and hill regions of the Carpathian forests. Background and Objectives: We focused on analyzing stems, as a function of diameter at breast height (DBH) and the total height (H), at sample plot level for natural forests, with the purpose of assessing the potential for transitioning available methodology to field work in Romania. Materials and Methods: We performed single and multiple scans using a FARO Focus 3D X130 phase shift terrestrial laser scanner at 122 kpts and 0.3:0.15 mm noise compression ratio, resulting in an average point density of 6pts at 10m. The point cloud we obtained underpinned the DBH and heights analysis. In order to reach values similar to those measured in the field, we used both the original and the segmented point clouds, postprocessed in subsamples of different radii. Results: Pearson’s correlation coefficient above 0.8 for diameters showed high correlation with the field measurements. Diameter averages displayed differences within tolerances (0.02 m) for 10 out of 12 plots. Height analysis led to poorer results. For both acquisition methods, the values of the correlation coefficient peaked at 0.6. The initial hypothesis that trees positioned at a distance equivalent to their height can be measured more precise, was not valid; no increase in correlation strength was visible for either heights or diameters as the distance from scanner varied (r = 0.52). Conclusions: With regard to tree biophysical parameters extraction, the acquisition method has no major influence upon visible trees. We emphasize the term “visible”, as an increase in the number of acquisitions led to an increased number of detected trees (16% in old stands and 29% in young stands). View Full-Text
Keywords: TLS; single scan; multiple scans; biophysical parameters TLS; single scan; multiple scans; biophysical parameters
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MDPI and ACS Style

Pascu, I.-S.; Dobre, A.-C.; Badea, O.; Tanase, M.A. Retrieval of Forest Structural Parameters from Terrestrial Laser Scanning: A Romanian Case Study. Forests 2020, 11, 392. https://doi.org/10.3390/f11040392

AMA Style

Pascu I-S, Dobre A-C, Badea O, Tanase MA. Retrieval of Forest Structural Parameters from Terrestrial Laser Scanning: A Romanian Case Study. Forests. 2020; 11(4):392. https://doi.org/10.3390/f11040392

Chicago/Turabian Style

Pascu, Ionuț-Silviu, Alexandru-Claudiu Dobre, Ovidiu Badea, and Mihai A. Tanase 2020. "Retrieval of Forest Structural Parameters from Terrestrial Laser Scanning: A Romanian Case Study" Forests 11, no. 4: 392. https://doi.org/10.3390/f11040392

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