LiDAR is the most suitable technology for mapping the ground through a forest's canopy. The penetrating laser pulses are able to capture ground and sub-canopy locations that are difficult to see in other airborne imagery or on ground surveying circumstances.
Examples of LiDAR uses:
LiDAR, which stands for Light Detection and Ranging, is a remote sensing method that uses pulsed lasers to measure ranges. These pulses generate precise, three-dimensional information about an object and its surface characteristics. Being one of the most versatile pieces of equipment, the LiDAR unit can be added to Ground Vehicles, Boats, Helicopters and Planes, Unmanned Aerial Vehicles, drones, or strapped to a backpack.