Surveying
If the general ground level of any area is 10% of the flying height, the principal points may be used as the centers of radial directions for small scale mapping even in tilted photograph up to

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to eccentricity of verniers
error due to displacement of station signals
error due to wrong adjustment of line of collimation and trunnion axis
error due to inaccurate graduation

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