| 摘要 |
A geodetic apparatus for performing measurements using a target and a method for controlling the geodetic apparatus is disclosed. The apparatus comprises a detector for measuring a position of the target relative to a sighting axis of the apparatus, a light emitter for outputting to an outside of the geodetic apparatus a first cone of light having a first wavelength and a second cone of light having a second wavelength different from the first wavelength, and a controller connected to both the detector and the light emitter. The first cone of light overlaps with the second cone of light at the distance of one meter from the apparatus by at least 30%. The controller is configured to control said light emitter based on the detected position of the target to output at least one of the first cone of light and the second cone of light.
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