LiDAR (Light Detection and Ranging) is a remote sensing technology in which the earth’s surface is scanned by laser pulses (electromagnetic waves). The result is a very dense and highly accurate three-dimensional point cloud.
One of the strengths of this technology lies in its ability to measure the terrain through the small gaps between the leaves of the canopy. On several occasions, this technology has even allowed us to accurately measure the terrain model under the rainforest.
Figure: Return signals according to the target hit by the pulse