Embodiments of systems, program products, and computer implemented methods to measure the displacement of an object located in a hazardous or otherwise inaccessible location at a long range from an optical device with micron-level accuracy are provided the object being. The objects can be machinery, valves, containers, or any other object whose displacement is to be measured. The object can be located in radioactive, chemically reactive, high voltage, or otherwise hazardous or inaccessible locations that are not accessible for conventional displacement measurement by personnel. A system can comprise an identifier on the object to be tracked, an optical device, an computer with at least processing, storage, and memory facilities, and a communications network.