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 3-D mapping of a multi-layered Mediterranean forest using ALS data
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/9264

title: 3-D mapping of a multi-layered Mediterranean forest using ALS data
authors: Ferraz, A.
Bretar, f.
Jacquemoud, S.
Gonçalves, G.
Gomes Pereira, L.
Tomé, M.
Soares. P.
keywords: Airborne laser scanning
Multi-layered forest
Unsupervised segmentation
Mean shift algorithm
Fuel mapping
Vertical stratification
Tree crown
3-D mapping
Ground vegetation
issue date: Jul-2012
publisher: Elsevier
abstract: This study presents a robust approach for characterization of multi-layered forests using airborne laser scanning (ALS) data. Fuel mapping or biomass estimation requires knowing the diversity and boundaries of the forest patches, as well as their spatial pattern. This includes the thickness of the main vegetation layers, but also the spatial arrangement and size of the individual plants that compose each stratum. In order to decompose the ALS point cloud into genuine 3-D segments corresponding to individual vegetation features, such as shrubs or tree crowns, we apply a statistical approach based on the mean shift algorithm. The segments are progressively assigned to a forest layer: ground vegetation, understory or overstory. Our method relies on a single biophysically meaningful parameter, the kernel bandwidth, which is related to the local forest structure. It is validated on 44 plots of a Portuguese forest, composed mainly of eucalyptus (Eucalyptus globulus Labill.) and maritime pine (Pinus pinaster Ait.) trees. The number of detected trees varies with the dominance position: from 98.6% for the dominant trees to 12.8% for the suppressed trees. Linear regression models explain up to 70% of the variability associated with ground vegetation and understory height.
URI: http://hdl.handle.net/10773/9264
ISSN: 0034-4257
publisher version/DOI: http://dx.doi.org/10.1016/j.rse.2012.01.020
source: Remote Sensing of Environment
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