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Forest understory trees can be segmented accurately within sufficiently dense airborne laser scanning point clouds

Hamraz, Hamid, Contreras, Marco A., Zhang, Jun·2017·Scientific Reports
DOI 10.1038/s41598-017-07200-0PMC PMC5533762
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Abstract

Airborne laser scanning (LiDAR) point clouds over large forested areas can be processed to segment individual trees and subsequently extract tree-level information. Existing segmentation procedures typically detect more than 90% of overstory trees, yet they barely detect 60% of understory trees because of the occlusion effect of higher canopy layers. Although understory trees provide limited financial value, they are an essential component of ecosystem functioning by offering habitat for numerous wildlife species and influencing stand development. Here we model the occlusion effect in terms of point density. We estimate the fractions of points representing different canopy layers (one overstory and multiple understory) and also pinpoint the required density for reasonable tree segmentation (where accuracy plateaus). We show that at a density of ~170 pt/m² understory trees can likely be segmented as accurately as overstory trees. Given the advancements of LiDAR sensor technology, point clouds will affordably reach this required density. Using modern computational approaches for big data, the denser point clouds can efficiently be processed to ultimately allow accurate remote quantification of forest resources. The methodology can also be adopted for other similar remote sensing or advanced imaging applications such as geological subsurface modelling or biomedical tissue analysis.

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Metadata

Authors
Hamraz, H., Contreras, M. A., & Zhang, J.
Venue
Scientific Reports
Publisher
Springer Science and Business Media LLC
Published
2017-07-28
Volume
7
Issue
1
ISSN
2045-2322
DOI
10.1038/s41598-017-07200-0
PMC
PMC5533762
Cited by
97
References
1
Language
en
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