Airborne LiDAR Mapping
A LiDAR collection system uses a powerful laser sensor comprised of a transmitter and a receiver, a geodetic-quality Global Positioning System (GPS) receiver, and an Inertial Navigation System (INS) unit. The technology resembles that used by radar sensors by which a device emits energy (focused light) and then measures the time it takes to travel to a target and return to a collector and at the same time compensates for the movement of the aircraft and the sensor.
The airborne LiDAR mapping technique is the only techniques that can provide terrain information below tree canopies accurately without interpolation other than an ordinary conventional ground topographical surveying. But in term of time and accuracy over massive size of forested site, the airborne laser system will be the best technique to work with.
