| 摘要 |
PROBLEM TO BE SOLVED: To detect the secular shift of a tracking optical system, to improve the reliability of collimation and to improve survey accuracy. SOLUTION: In this automatic survey machine provided with the tracking optical system 31, the tracking optical system 31 is provided with a light emission part 36, a light reception part 40 and an optical member 42 for indicating the position of tracking light emitted from the light emission part 36 and the error of the tracking optical system 31 is detected based on the image position of the tracking light formed at the light reception part 40 by the optical member 42. Thus, since the secularly generated error of the tracking optical system 31 is detected, the excellent effects of correcting the error of the optical axis of the tracking optical system 31 based on the detected error, maintaining highly accurate survey and improving the reliability of the survey are demonstrated.
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