Identification and characterization of gaps and roads in the Amazon rainforest with LiDAR data
José Augusto Spiazzi Favarin (1) , Mateus Sabadi Schuh (2), Juliana Marchesan (2), Elisiane Alba (3), Rudiney Soares Pereira (4)
iForest - Biogeosciences and Forestry, Volume 17, Issue 4, Pages 229-235 (2024)
doi: https://doi.org/10.3832/ifor4295-017
Published: Aug 03, 2024 - Copyright © 2024 SISEF
Research Articles
Abstract
Gap formations in the forest canopy have natural causes, such as bad weather, and anthropic ones, such as sustainable selective extraction of trees and illegal logging, which can already be detected through orbital remote sensing. However, the Amazon region is under frequent cloud cover, which makes it challenging to detect gaps using passive sensors. This study aimed to identify and delimit gaps in the Amazon forest canopy through airborne LiDAR (Light Detection and Ranging) sensor application while testing six different return densities. LiDAR and forest inventory data were obtained over an Amazon rainforest region, defining the minimum area as a forest canopy gap. The point cloud was processed to obtain six return densities with the generation of their respective CHM (Canopy Height Model), which were applied for segmentation and subsequent identification of gap areas and roads. The minimum gap area found was 34 m2, and the Kruskal Wallis test showed no significant difference among the six densities in gap detection; however, road identification decreased as the return density decreased. We concluded that LiDAR data proved promising as point clouds with low return density can be used without impairing gap identification. However, reducing the return density for road identification is not recommended.
Keywords
Forest Canopy Gaps, Aerial Laser Scanning, Point Density, Remote Sensing
Authors’ Info
Authors’ address
Postgraduate Program in Forest Sciences, Federal University of Paraná /UFPR, Lothário Meissner Avenue, 632, Jardim Botnico, 80210-170, Curitiba, PR (Brazil)
Juliana Marchesan 0000-0002-2167-5862
Postgraduate Program in Forest Engineering, Federal University of Santa Maria/UFSM, Roraima Avenue, 1000, Camobi, 97105-900, Santa Maria, RS (Brazil)
Academic Unity of Serra Talhada, Federal Rural University of Pernambuco/UFRPE, Gregório Ferraz Nogueira Av., 56909-535, Serra Talhada, PE (Brazil)
Rural Engineering Department, Federal University of Santa Maria/UFSM, Roraima Avenue, 1000, Camobi, 97105-900, Santa Maria, RS (Brazil)
Corresponding author
Paper Info
Citation
Spiazzi Favarin JA, Sabadi Schuh M, Marchesan J, Alba E, Soares Pereira R (2024). Identification and characterization of gaps and roads in the Amazon rainforest with LiDAR data. iForest 17: 229-235. - doi: 10.3832/ifor4295-017
Academic Editor
Matteo Garbarino
Paper history
Received: Dec 27, 2022
Accepted: Jun 11, 2024
First online: Aug 03, 2024
Publication Date: Aug 31, 2024
Publication Time: 1.77 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2024
Open Access
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