1. A method of determining a pose of a workpiece, the method comprising: receiving known positions of a plurality of reference features of a workpiece in a first pose in a first coordinate space; determining from the known positions an estimate of the first pose of the workpiece in a second coordinate space in which any pose of the workpiece including the first pose is definable by six distinct components, at least one of the six components of the first pose being known; receiving a position of a second feature of the workpiece in the second coordinate space, the workpiece being disposed in a distinct, second pose in which the at least one of the six known components of the first pose are common to the second pose; and determining the second pose of the workpiece from the estimate of the first pose of the workpiece and the position of the second feature of the workpiece in the second pose.