TOTAL STATION WITH A CALIBRATION FUNCTIONALITY FOR INSTRUMENT ERRORS

The invention relates to a total station with a computer unit configured for receiving from a camera of the total station a first image captured in a first face and a second image captured in a second face, wherein in the second face the camera is rotated around the optical axis by between 170° and 190° compared to the first face, and wherein the fields of view of the camera in the first face and in the second face overlap at least in part, receiving from respective angle encoder(s) of the total station at least one of an azimuthal angle pair and an elevative angle pair, said azimuthal angle pair comprising a first azimuthal angle in a first face and a second azimuthal angle in a second face, and said elevative angle pair comprising a first elevative angle in the first face and a second elevative angle in the second face, matching the first image and the second image with a relative rotation and a relative translation, determining the relative rotation of the matched first image and second image, determining the relative translation of the matched first image and second image, based on the respective angle pair(s), the relative rotation, the relative translation, determining an instrument error comprising at least one of a horizontal collimation error, a vertical index error, based on the instrument error, applying an angle offset to each reading of the respective angle encoder(s).