14.4. Active and stereoscopic remote sensing methods
14.4.1. Lidar data
14.4.1.1. Small-footprint lidar
Discrete-return airborne laser sensors produce a three-dimensional cloud of points depicting the horizontal and vertical distribution of biological material with high spatial resolution. The strong relationships that exist between laser data and AGB can be attributed to the ability of airborne lasers to accurately capture the canopy height and density of the canopy, both of which are highly correlated with biomass. Every point in the point cloud data is a direct measurement of the height of a reflector within the canopy. But these points need to be aggregated to a certain scale to depict the three-dimensional structure of a vegetation ...
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