The profiling system Airborne Laser (ALS - Airborne Laser Scanning) is an active remote sensor coupled inside the aircraft. The beam emitted by the sensor measures the distance between the system and the surface of the objects effectively, obtaining three-dimensional digital data of the ground surface and with great precision. SAI operates using both the laser equipment and digital cameras, thus obtaining both of the details in the same overflight. The aerial surveys of SAI Brazil can be made with helicopter or plane. "SAI has own fleet"