Abstract: The invention relates to a method for repositioning a numerically controlled device by using an image taken of an object as an aid. According to the method, the system is taught in such a way that a child image is defined for the camera's image, either its own set of co-ordinates is formed for the element or a set of coordinates is retrieved from elsewhere, and the image thus obtained, together with its co-ordinates, is stored in the data system, and, in the repositioning situation, the real-time image is compared with the child image stored in the data system, in order to determine the real-time position of the imaging device relative to the stored image. The set of co-ordinates used is a set of co-ordinates retrieved using satellite positioning, or the device's own internal set of co-ordinates. In the repositioning situation, the image stored in the teaching situation is sought as the co-ordinate point of the image stored in the memory is approached.

Abstract: A crane control based on quoted location data and observed ambient data provided by at least one identifier, the goods to be conveyed by the crane can be controlled to the location site. The identifier takes pictures of at least two difference areas, which is implemented so that the identifier is pivotable, or fixed, whereby the certain image area directed to the identifier is reflected from a reflecting surface.