期刊
REMOTE SENSING OF ENVIRONMENT
卷 121, 期 -, 页码 210-223出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2012.01.020
关键词
Airborne laser scanning; LiDAR; Multi-layered forest; Unsupervised segmentation; Mean shift algorithm; Fuel mapping; Vertical stratification; Tree crown; 3-D mapping; Ground vegetation; Understory; Overstory
资金
- Portuguese Foundation for Science and Technology
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. (c) 2012 Elsevier Inc. All rights reserved.
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