Patent ID: 9605957
Date: 2017-03-28
CPC Classifications: G01C

Claim:
1. A surveying instrument, comprising a surveying instrument main unit having a machine reference point already known, a telescope unit installed on said surveying instrument main unit and for sighting a measuring point, a leveling unit for leveling said surveying instrument main unit, a laser pointer projecting unit for projecting a laser pointer beam in a downward direction along a vertical axis of said surveying instrument main unit and for performing distance measurement, a rotation driving unit for rotating said telescope unit in a direction as desired, a horizontal angle detecting unit for detecting a horizontal angle of said surveying instrument main unit, a vertical angle detecting unit for detecting a vertical angle of said telescope unit, a tilt angle detecting unit for detecting a tilt angle of said surveying instrument main unit, and a control device, wherein said control device calculates relative space coordinates of said machine reference point of said surveying instrument main unit with respect to a projecting point of said laser pointer beam based on a distance measurement value obtained by said laser pointer projecting unit and on a tilt angle at the time of distance measurement.