Terrestrial Laser Scanning (TLS) is a ground-based, active imaging method that rapidly acquires accurate, dense 3D point clouds of object surfaces by laser range finding.
TLS is used to collect extremely detailed 3D information about a surface. TLS sensors use LiDAR, an active RS technology that uses either a reflected laser pulse to measure the distance to an object
Instead of individual points being measured on very specific ground features by a field surveyor using a total station (as required for large-scale engineering and topographic maps) the laser scanner allows the automated measurement and location of tens or hundreds or thousands of non-specific points in the area surrounding the position where the instrument had been set up.
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