Patent ID: 8908169

Claim:
A measuring method for performing monitoring measurement on a plurality of measuring points by using a measuring instrument, which comprises a telescope unit for performing sighting of a measuring point, which is set up at a plurality of places within a measurement range, where an initial value of a set up position is already known, a distance measuring unit for measuring a distance to the measuring point by projecting a distance measuring light through said telescope unit, an image sensor for taking an image in direction of measurement and for acquiring a digital image, angle detecting units each for detecting a directional angle in sighting direction of said telescope unit, and an arithmetic unit for making said telescope unit perform automatic sighting to the measuring point and for calculating directional angles of the measuring point based on a deviation of the measuring point on the digital image from a sighting axis and based on a result of detection from said angle detecting unit, wherein said monitoring measurement comprises a coarse monitoring measurement and a precise monitoring measurement, wherein said coarse monitoring measurement acquires a digital image while scanning the measurement range and detects a directional angle of a measurement point from said digital image and said angle detecting units, wherein said precise monitoring measurement acquires a deviation between the directional angle of a measurement point acquired by the coarse monitoring measurement and a directional angle of said initial value, performs automatic sighting on said measurement point by said telescope unit based on a directional angle of said initial value with respect to the measuring point where the deviation exceeds a first threshold value, performs a distance measurement by said distance measuring unit and performs angle measurement by said angle detecting unit.