Adaptive Mean Shift-Based Identiﬁcation of Individual Trees Using Airborne LiDAR Data
AbstractIdentifying individual trees and delineating their canopy structures from the forest point clouddataacquiredbyanairborneLiDAR(LightDetectionAndRanging)hassigniﬁcantimplications in forestry inventory. Once accurately identiﬁed, tree structural attributes such as tree height, crown diameter, canopy based height and diameter at breast height can be derived. This paper focuses on a novel computationally efﬁcient method to adaptively calibrate the kernel bandwidth of a computational scheme based on mean shift—a non-parametric probability density-based clustering technique—to segment the 3D (three-dimensional) forest point clouds and identify individual tree crowns. The basic concept of this method is to partition the 3D space over each test plot into small vertical units (irregular columns containing 3D spatial features from one or more trees) ﬁrst, by using a ﬁxed bandwidth mean shift procedure and a small square grouping technique, and then rough estimation of crown sizes for distinct trees within a unit, based on an original 2D (two-dimensional) incremental grid projection technique, is applied to provide a basis for dynamical calibration of the kernel bandwidth for an adaptive mean shift procedure performed in each partition. The adaptive mean shift-based scheme, which incorporates our proposed bandwidth calibration method, is validated on 10 test plots of a dense, multi-layered evergreen broad-leaved forest located in South China. Experimental results reveal that this approach can work effectively and when compared to the conventional point-based approaches (e.g., region growing, k-means clustering, ﬁxed bandwidth or multi-scale mean shift), its accuracies are relatively high: it detects 86 percent of the trees (“recall”) and 92 percent of the identiﬁed trees are correct (“precision”), showing good potential for use in the area of forest inventory. View Full-Text
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Hu, X.; Chen, W.; Xu, W. Adaptive Mean Shift-Based Identiﬁcation of Individual Trees Using Airborne LiDAR Data. Remote Sens. 2017, 9, 148.
Hu X, Chen W, Xu W. Adaptive Mean Shift-Based Identiﬁcation of Individual Trees Using Airborne LiDAR Data. Remote Sensing. 2017; 9(2):148.Chicago/Turabian Style
Hu, Xingbo; Chen, Wei; Xu, Weiyang. 2017. "Adaptive Mean Shift-Based Identiﬁcation of Individual Trees Using Airborne LiDAR Data." Remote Sens. 9, no. 2: 148.