LiDAR (Light Detection And Ranging) is an optical means of measuring reflected light from distant objects to determine range, and from this information, to determine position. LiDAR uses 1.064 nanometer wavelength laser light pulses, and Bathymetric LiDAR uses 532 nanometer wavelength light because the green penetrates the water better, to measure distances by recording the time delay from the transmitted pulse and light reflected back from objects. Coupled with accurate position and orientation systems, LiDAR systems can take accurate 3D measurements of objects and surfaces using high sampling densities. Applications include engineering, remote sensing, forestry, geomatics and more.
LiDAR systems can be divided into two major types: terrestrial and airborne. Terrestrial systems are operated at ground level scanning in a horizontal direction while rotating about a vertical axis.