Title | ||
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Delineation of Tree Crowns and Tree Species Classification From Full-Waveform Airborne Laser Scanning Data Using 3-D Ellipsoidal Clustering |
Abstract | ||
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Individual tree crowns can be delineated from dense airborne laser scanning (ALS) data and their species can be classified from the spatial distribution and other variables derived from the ALS data within each tree crown. This study reports a new clustering approach to delineate tree crowns in three dimensions (3-D) based on ellipsoidal tree crown models (i.e., ellipsoidal clustering). An important feature of this approach is the aim to derive information also about the understory vegetation. The tree crowns are delineated from echoes derived from full-waveform (fwf) ALS data as well as discrete return ALS data with first and last returns. The ellipsoidal clustering led to an improvement in the identification of tree crowns. FwfALS data offer the possibility to derive also the echo width and the amplitude in addition to the 3-D coordinates of each echo. In this study, tree species are classified from variables describing the fwf (i.e., the mean and standard deviation of the echo amplitude, echo width, and total number of echoes per pulse) and the spatial distribution of the clusters for pine, spruce, birch, oak, alder, and other species. Supervised classification is done for 68 field plots with leave-one-out cross-validation for one field plot at a time. The total accuracy was 71% when using both fwf and spatial variables, 60% when using only spatial variables, and 53% when using discrete return data. The improvement was greatest for discriminating pine and spruce as well as pine and birch. |
Year | DOI | Venue |
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2014 | 10.1109/JSTARS.2014.2331276 | Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of |
Keywords | Field | DocType |
geophysical image processing,geophysical techniques,remote sensing by laser beam,vegetation,3-d ellipsoidal clustering,dense als data,ellipsoidal clustering,ellipsoidal tree crown models,full-waveform airborne laser scanning data,supervised classification,tree crown identification,tree crowns classification,tree species classification,understory vegetation,canopy layers,individual trees,light detection and ranging (lidar),single tree detection,three-dimensional (3-d) model,remote sensing,ellipsoids,solid modeling | Ellipsoid,Laser scanning,Remote sensing,Tree species,Waveform,Cluster analysis,Amplitude,Standard deviation,Mathematics,Spatial distribution | Journal |
Volume | Issue | ISSN |
7 | 7 | 1939-1404 |
Citations | PageRank | References |
7 | 0.82 | 3 |
Authors | ||
5 |
Name | Order | Citations | PageRank |
---|---|---|---|
eva lindberg | 1 | 26 | 4.41 |
lothar eysn | 2 | 25 | 2.44 |
M. Hollaus | 3 | 76 | 10.89 |
Johan Holmgren | 4 | 116 | 15.32 |
Norbert Pfeifer | 5 | 71 | 12.99 |