Assessment of forest structure using two UAV techniques: a comparison of airborne laser scanning and structure from motion (SfM) point clouds

Wallace, L, Lucieer, A, Malenovský, Z, Turner, D and Vopenka, P 2016, 'Assessment of forest structure using two UAV techniques: a comparison of airborne laser scanning and structure from motion (SfM) point clouds', Forests, vol. 7, no. 3, pp. 1-16.


Document type: Journal Article
Collection: Journal Articles

Title Assessment of forest structure using two UAV techniques: a comparison of airborne laser scanning and structure from motion (SfM) point clouds
Author(s) Wallace, L
Lucieer, A
Malenovský, Z
Turner, D
Vopenka, P
Year 2016
Journal name Forests
Volume number 7
Issue number 3
Start page 1
End page 16
Total pages 16
Publisher MDPI AG
Abstract This study investigates the potential of unmanned aerial vehicles (UAVs) to measure and monitor structural properties of forests. Two remote sensing techniques, airborne laser scanning (ALS) and structure from motion (SfM) were tested to capture three-dimensional structural information from a small multi-rotor UAV platform. A case study is presented through the analysis of data collected from a 30 ˆ 50 m plot in a dry sclerophyll eucalypt forest with a spatially varying canopy cover. The study provides an insight into the capabilities of both technologies for assessing absolute terrain height, the horizontal and vertical distribution of forest canopy elements, and information related to individual trees. Results indicate that both techniques are capable of providing information that can be used to describe the terrain surface and canopy properties in areas of relatively low canopy closure. However, the SfM photogrammetric technique underperformed ALS in capturing the terrain surface under increasingly denser canopy cover, resulting in point density of less than 1 ground point per m2 and mean difference from ALS terrain surface of 0.12 m. This shortcoming caused errors that were propagated into the estimation of canopy properties, including the individual tree height (root mean square error of 0.92 m for ALS and 1.30 m for SfM). Differences were also seen in the estimates of canopy cover derived from the SfM (50%) and ALS (63%) pointclouds. Although ALS is capable of providing more accurate estimates of the vertical structure of forests across the larger range of canopy densities found in this study, SfM was still found to be an adequate low-cost alternative for surveying of forest stands.
Subject Photogrammetry and Remote Sensing
Forestry Management and Environment
Keyword(s) unmanned aerial vehicle (UAV)
LIDAR airborne laser scanning
structure from motion
digital terrain model
forest structure
canopy cover
tree height
DOI - identifier 10.3390/f7030062
Copyright notice © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
ISSN 1999-4907
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