SURVEYING INSTRUMENT

PROBLEM TO BE SOLVED: To provide a surveying instrument for computing the location of an accurate survey target point on a screen provided for the surveying instrument in consideration of the displacement between the optical axes of a telescope and a digital camera, synthesizing a point mark indicating the accurate survey target point with an image, and recording it in a recording medium. SOLUTION: A survey target point 34 is collimated to an object to be surveyed 33. Since the optical axis 36 of an imaging optical system 38 is out of line with the optical axis 37 of a telescope optical system 39, a center point of an image displayed on a camera display device does not match the survey target point 34 present on the optical axis 37 of the telescope optical system 39. The amount of displacement between the center point and the survey target point 34 on the image in a horizontal direction is computed as dHLp, and the amount of displacement between them in a vertical direction is computed as dVLp. A location acquired by moving the determined amounts of displacement in the horizontal direction and the vertical direction from the center point of the image is the location of the survey target point 34 on the image. COPYRIGHT: (C)2008,JPO&INPIT