Photogrammetry
Photogrammetry is a surveying technique that uses image processing to obtain position, shape, and size of an object being detected. This process is divided into three phases: capture, frame orientation, and return. Photogrammetric surveys can be performed in aerial mode, using drones, or terrestrial with the use of a camera.
Laser Scanner
Laser scanners are special devices that allow object detection thanks to a laser beam. The laser light hits the surface of the object and in relation to the time necessary to bounce back, the device's angle and other position factors, it is then possible to identify the exact position in space of each point of the object. There are three types of laser scanners: Time-of-Flight (TOF) Scanners, Phase-Based Scanners and Triangulation Scanners.
Drones
Drones provide precise and reliable aerophotogrammetric surveys. There are three macrocategories of drones: Fixed-Wing Drones, Multirotor Drones, Single-Rotor or Helicopter Drones The operations necessary to obtain the aerophotogrammetric surveys include the identification of the area to be detected, the choice of take-off and landing points, flight planning, image acquisition, frame orientation and scene reconstruction.