Terrestrial laser scanning (TLS), mobile laser scanning (MLS), a hand-held laser scanning
Terrestrial Laser Scanning (TLS), also referred to as terrestrial LiDAR (light detection and ranging) or topographic LiDAR, acquires XYZ coordinates of numerous points on land by emitting laser pulses toward these points and measuring the distance from the device to the target. The number of measurable points within a certain period is much larger than those of Total Station (TS); a modern TLS device can measure 104–106 points per second with an accuracy of 10−1–100 cm.
Terrestrial scanning uses a ground-based or tripod-mounted light radar to create high resolution 3D images of surfaces and objects. LiDAR measures a scanned object by emitting laser pulses and recording the subsequent intensity of their return when reflected off it. Scanning can be performed over kilometers with sub-centimeter precision. Terrestrial scanning is commonly used for heritage documentation, 3D topographical surveys, accident sites, confined spaces survey and Mechanical, Electrical and Plumbing (MEP) models.
Mobile Laser Scanning (MLS): Unlike Terrestrial scanning, which is performed from a static position, mobile laser scanning collects geospatial data from a mobile vehicle fitted with LiDAR, cameras and other remote sensors. This mobility can be provided by cars, trains, trucks, manned and unmanned aerial vehicles and boats.
Mobile laser scanning is used in emergency response situations to quickly assess the conditions on the ground, as well as for popular mapping projects such as Google Maps and Street View. Location services on smartphones rely on mobile mapping to plot the position of the phone.
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