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Localizing a surveying instrument in relation to a ground mark

  • US 8,345,928 B2
  • Filed: 06/26/2008
  • Issued: 01/01/2013
  • Est. Priority Date: 02/12/2008
  • Status: Active Grant
First Claim
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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:

  • aligning a vertical rotational axis of the surveying instrument with said mark using a pointing device;

    capturing an image of the ground below the housing with said at least one camera arranged in a camera position and orientation, said camera position being eccentric to a rotation center of the surveying instrument;

    identifying an object point corresponding to the mark in the captured image;

    measuring image coordinates of the identified object point in the captured image; and

    determining a height of the rotation center of said instrument above the ground based on the measured image coordinates and camera calibration data.

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