(Concerns mobile and airborne laser scanning) An integrated IMU/GNSS system consists of at least an inertial measurement unit (IMU) and a GNSS receiver, and provides the trajectory of the IMU coordinate system by post-processing raw data from IMU, GNSS receiver, and a GNSS base station. By mechanically fixing the IMU to the laser scanner, the trajectory also gives the position and orientation of the laser scanner over time so that the point cloud provided by the laser scanner can be transformed into the coordinate system the trajectory is specified in (usually WGS84).
