Surveying
The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is

2000 m
1000 m
500 m
1500 m

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Surveying
Refraction correction

partially eliminates curvature correction
completely eliminates curvature correction
adds to the curvature correction
has no effect on curvature correction

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