LiDAR is typically a collimated light beam with minimal divergence over long distances from the transmitter, basically LiDAR is a remote sensing technology: sensors that are mounted to drones send a pulse from a laser to collect measurements, which can then be used to create very precise models (including 3D models) and maps of objects and environments.. LIDAR uses lightwave frequencies which have a shorter wavelength enhancing the capability of collecting data
Terrestrial Laser Scanning (Terrestrial LiDAR)
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 (Vosselman and Maas, 2010).
Terrestrial laser scanning uses ground-based remote sensing systems. These systems can be mounted on static tripods and scan in all directions, including upwards. Once scans of a single area are complete, the tripod is moved to another location to scan from another angle or capture data from a new area. Static laser scanners often gather data from architectural and engineering structures, building interiors, areas of dense vegetation, mining, and archaeology sites. Terrestrial laser scanning is also a subtype of MLS. Systems mounted on land-based vehicles are considered both terrestrial and mobile. Mobile terrestrial systems frequently survey road networks, industrial plants, and other large areas.
Terrestrial Laser Scanners have applications in many different areas such as deformation measurements, quality control or topographical surveying and cultural heritage monitoring. This broadly used survey instrument is also called static terrestrial laser sanners (STLS), 3D scanner, 3D laser scanner or Lidar scanner.