A system is disclosed for accurately measuring the position of a moored container ship relative to a fixed pier after loading or unloading each container on the ship and including a processor mechanism employed to combine the measured relative position with previously acquired data indicating the ship position prior to the loading or unloading of the previous container, and utilizing the combined data to facilitate automatic control of placing or removing a subsequent container on the ship by a crane structure. The system is applicable for measuring six degrees of freedom of movement of any large object.
展开▼
