Fusion is a LiDAR viewing and analysis software tool developed by the Silviculture and Forest Models Team, Research Branch of the US Forest Service. Fusion also works with IFSAR and terrain data sets. LIDAR uses a laser sensor comprised of a transmitter and receiver, a geodetic-quality Global Positioning System (GPS) receiver and an Inertial Navigation System (INS) unit. The laser sensor is mounted to the underside of an aircraft. Once airborne, the sensor emits rapid pulses of infrared laser light, which are used to determine ranges to points on the terrain below. For more information: http://forsys.cfr.washington.edu/fusion/fusion_overview.html
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