The invention provides a rover, which comprises a pole of which lower end indicates a point to be measured, a measurement auxiliary apparatus provided at a predetermined position of the pole, a direction detecting device integrally provided with the measurement auxiliary apparatus and for detecting a direction of the measurement auxiliary apparatus, and an object to be measured provided at a known distance from the lower end of the pole,;wherein the measurement auxiliary apparatus comprises a horizontal detecting unit which is supported so as to be rotatable around two shafts orthogonal to each other and detects the tilts in two axial directions, motors provided so as to rotate the shafts, encoders provided respectively on the shafts, and an arithmetic processing component for controlling the motors in such a manner that the horizontal detecting unit becomes horizontal based on a detection result from the horizontal detecting unit, wherein the encoders are configured to detect a rotation amount of each shaft in a case where the horizontal detecting unit becomes horizontal, and the arithmetic processing component is configured to calculate the tilts in the two axial directions based on the detection results from the encoders and to calculate a deviation of the object to be measured in two horizontal directions with respect to the point to be measured and a deviation in a vertical direction with respect to the known distance based on a calculation result, the known distance, and a tilting direction obtained from a direction detecting device.
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