Lidar
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Airborne LiDAR are systems comprising high powered laser scanners mounted in an aircraft that measures the time that the laser takes to return from the object it was fired at.  This, combined with the position and orientation of the scanner (determined by differential kinematic GPS and an Inertial Measurement Unit), then gives us measurements of the height of distinct points in the topography below the aircraft. We can achieve accuracies of up to +/-5cm with point densities up to 30 points per sq m.

 This, combined with the position and orientation of the scanner (determined by differential kinematic GPS and an Inertial Measurement Unit), then gives us measurements of the height of distinct points in the topography below the aircraft. We can achieve accuracies of up to +/-5cm with point densities up to 30 points per sq m.

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