Laser scanning

In modern surveying, the general meaning of laser scanning is the controlled deflection of laser beams, visible or invisible. In modern surveying, the general meaning of laser scanning is the controlled deflection of laser beams, visible or invisible. Within the field of 3D object scanning, laser scanning (also known as lidar) combines controlled steering of laser beams with a laser rangefinder. By taking a distance measurement at every direction the scanner rapidly captures the surface shape of objects, buildings and landscapes. Construction of a full 3D model involves combining multiple surface models obtained from different viewing angles, or the admixing of other known constraints. Small objects can be placed on a revolving pedestal, in a technique akin to photogrammetry.