Patent ID: 8629905
Filing Date: 2014-01-14
Classification: G01C

Abstract:
1. A method for localizing, in relation to a mark located at a ground level, a surveying instrument having a housing including at least one camera, said method comprising: capturing a first image of the ground below the housing in a first camera position and orientation, said first camera position being eccentric to a vertical rotational axis of the surveying instrument; identifying an object point corresponding to the mark in the first image; measuring first image coordinates of the object point in the first image; capturing a second image of the ground below the housing in a second camera position and orientation; identifying, in the second image, the object point corresponding to the mark; measuring second image coordinates of the object point in the second image; and determining the height of a rotation center of the surveying instrument above the mark based on the first camera position and orientation, the first image coordinates, the second camera position and orientation, the second image coordinates, and camera calibration data.