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What is it and how the 3D laser scanner works It is a method of spatial measurement data remotely (non-contact method with object) Based on the LIDAR Technology (Light Detection And Ranging) or laser Radar: Positioning anobject by sending and receiving beam laser. Mirror mechanism deflects the beam to scan the whole object with the desired density(resolution). Produced rapidly measuring pointcloud with additional color information for each point (x, y, z, i) or(x, y, z, r, g, b)
Types and characteristics of terrestrial laser scanners •Depending on the configuration of the carrier wave are divided into: –pulse: •range (+): up to 3 km for 80-90% reflectivity of object •speed (-): up to ten of thousands of points per second (effective rep. rate) •accuracy (-): better than 1 cm •noise (+): limited for most measurement conditions and materials –phase shift: •range (-): up to 200 m for 80-90% reflectivity of object •speed (+): up to about 1 million points per second •accuracy (+): of the order of 1-2 mm •noise (-): increased in bright light (sun) and dark materials •Other important features: Field of View - Analysis - beam Characteristics (spot size, divergence) - Dimensions & Weight- battery Autonomy - RGB color rendering - Interface - Storage - Secure
Types and characteristics of terrestrial laser scanners Moving systems of terrestrial laser scanning : •Suitable for surveying zones - corridors from a moving vehicle. •They combine: –One or - usually - more laser scanners. –Capturing system for digital photos or video –GPS - IMU - odometer. For positioning and orientation. –Controlling devices, power supply, storage, etc. •Directly produce georeferenced point cloud, with typically good accuracy of 5 cm, with the possibility of improvement through ground control points. •Important characteristics: Precision of Scanners and GPS-IMU, scanning speed, resolution, speed, range, ergonomics, integration level, calibration requirements , security, etc.
Application areas of 3D laser scanning Usual 3D surveys •Large engineering projects (bridges, tunnels, dams, roads, junctions, etc.). •Urban environment (city modeling, etc). •mine sites, quarry sites, landfill sites etc. •Geological formations, slopes, landslides, etc. •Archaeological (monuments, archaeological sites, excavations, statues, objects, etc). •Architecture (facades, interiors and exteriors, etc.). •Industrial and mechanical installations or objects (refineries, factories, pylons, antennas, cables, machines, vehicles, etc). •accidents positions , disasters, areas forensic interest, etc.
Laboratory of Architectural Forms  and Preservation Studies
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