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1. A surveying instrument comprising: a surveying instrument main body, wherein said surveying instrument main body includes a distance measuring module configured to project the distance measuring light toward an object and to perform the distance measurement based on the reflected distance measuring light from said object, an optical axis deflector configured to at least uniaxially perform a scan using said distance measuring light, a storage module configured to store a two-dimensional map having the positional information of a plurality of measuring points, and an arithmetic control module configured to control operations of said distance measuring module and said optical axis deflector, and said arithmetic control module is configured to compare two-dimensional coordinates excluding a height in three-dimensional coordinates of each point acquired along a locus of said distance measuring light with said positional information of said measuring point in said two-dimensional map, and select a point which is in a range of a threshold value set in advance from said positional information of said measuring point in said two-dimensional map as said measuring point.
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