LASERMAP




		LIDAR systems use a laser beam which is reflected back from whatever it hits (excepting water) to a sensor which records the time interval from emission to reception. Consequently, in a forest, data are typically received from the tops of trees, branches and leaves all the way down, as well as where the signal hits the ground. The processing of these data requires skill to determine which data are which. From the strength and return times of the signals, the top of the tree canopy can be determined. Typically, the last return is the ground. Information in between is removed by sophisticated filtering algorithms. With the help of some ground truthing, volumes of timber can be calculated, providing a speedy way of evaluating timber resources over a wide area.



	Erosion surveys

	Topographic surveys

	Forestry application

	Flood risk mapping

	Digital Orthophoto

	Road and railroad surveys

	Electricity transmission lines


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