Assessing Biodiversity in Boreal Forests with UAV-Based Photogrammetric Point Clouds and Hyperspectral Imaging

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dc.contributor.author Saarinen, Ninni
dc.contributor.author Vastaranta, Mikko
dc.contributor.author Näsi, Roope
dc.contributor.author Rosnell, Tomi
dc.contributor.author Hakala, Teemu
dc.contributor.author Honkavaara, Eija
dc.contributor.author Wulder, Michael A.
dc.contributor.author Luoma, Ville
dc.contributor.author Tommaselli, Antonio M. G.
dc.contributor.author Imai, Nilton N.
dc.contributor.author Ribeiro, Eduardo A. W.
dc.contributor.author Guimarães, Raul B.
dc.contributor.author Holopainen, Markus
dc.contributor.author Hyyppä, Juha
dc.date.accessioned 2018-11-15T09:43:33Z
dc.date.available 2018-11-15T09:43:33Z
dc.date.issued 2018-02-23
dc.identifier.citation Remote Sensing 10 (2): 338 (2018)
dc.identifier.uri http://hdl.handle.net/10138/262140
dc.description.abstract Forests are the most diverse terrestrial ecosystems and their biological diversity includes trees, but also other plants, animals, and micro-organisms. One-third of the forested land is in boreal zone; therefore, changes in biological diversity in boreal forests can shape biodiversity, even at global scale. Several forest attributes, including size variability, amount of dead wood, and tree species richness, can be applied in assessing biodiversity of a forest ecosystem. Remote sensing offers complimentary tool for traditional field measurements in mapping and monitoring forest biodiversity. Recent development of small unmanned aerial vehicles (UAVs) enable the detailed characterization of forest ecosystems through providing data with high spatial but also temporal resolution at reasonable costs. The objective here is to deepen the knowledge about assessment of plot-level biodiversity indicators in boreal forests with hyperspectral imagery and photogrammetric point clouds from a UAV. We applied individual tree crown approach (ITC) and semi-individual tree crown approach (semi-ITC) in estimating plot-level biodiversity indicators. Structural metrics from the photogrammetric point clouds were used together with either spectral features or vegetation indices derived from hyperspectral imagery. Biodiversity indicators like the amount of dead wood and species richness were mainly underestimated with UAV-based hyperspectral imagery and photogrammetric point clouds. Indicators of structural variability (i.e., standard deviation in diameter-at-breast height and tree height) were the most accurately estimated biodiversity indicators with relative RMSE between 24.4% and 29.3% with semi-ITC. The largest relative errors occurred for predicting deciduous trees (especially aspen and alder), partly due to their small amount within the study area. Thus, especially the structural diversity was reliably predicted by integrating the three-dimensional and spectral datasets of UAV-based point clouds and hyperspectral imaging, and can therefore be further utilized in ecological studies, such as biodiversity monitoring.
dc.publisher Multidisciplinary Digital Publishing Institute
dc.title Assessing Biodiversity in Boreal Forests with UAV-Based Photogrammetric Point Clouds and Hyperspectral Imaging
dc.date.updated 2018-11-15T09:43:33Z
dc.type.uri http://purl.org/eprint/entityType/ScholarlyWork
dc.type.uri http://purl.org/eprint/entityType/Expression
dc.type.uri http://purl.org/eprint/entityType/Expression

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