Surveying
The want of correspondence in stereo-photographs

Is not affected by the change of flying height between photographs
Is a good property
Is minimum when θ is 3°
Is a function of tilt

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Surveying
The difference between a level line and a horizontal line is that

horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is a curved line while hori-zontal line is a straight line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same

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