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Schematic diagrams of laser scanning mechanisms ((a) RoT, (b) RiM, (c) RoM, (d) SeMM and SeMJ, and (e) ToA) and schematic diagrams of tree-top scan principles ((f) vertical scan profiles and (g) tilt scan profiles), wherein (f) features (a), (d) and (e), while (g) refers to (b) and (c). In addition, (h) shows the style of laser emissions in a scan profile. O indicates the locations of the laser scanners. See text for the definition of symbols.
