Surveying
The two point problem and three point problem are methods of

resection
orientation
resection and orientation
traversing

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line passing through the center of cross hairs and the center of eye piece

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

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
level line is a curved line while hori-zontal line is a straight line
horizontal line is normal to plumb line while level line may not be normal to the plumb line

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