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Using Multi-Spectral UAV Imagery to Extract Tree Crop Structural Properties and Assess Pruning Effects

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Figure

Figure 1. (a) Study area location (yellow dot) approximately 25 km southeast of Brisbane; (b) overview photo of study site; and (c) field photo of the lychee trees and poles used for protective nets to cover the trees
Figure 2. (a) Distribution and (b) in-situ field photo of AeroPoints used for geo-referencing of the UAV imagery
Figure 3. (a) Eight radiometric calibration targets and the 3DR Solo quadcopter; (b) green band; (c) red band;  (d) red edge band; (e) NIR band; and (f) corresponding reflectance signatures between 500 and 900 nm of the eight targets
Figure 4. Flowchart of GEOBIA processing routine to map individual tree crowns.
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