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what is the difference between level line and line of sight?

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what is the difference between level line and line of sight?

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A level line is the distance between 2 points on the level surface, which follows the curvature of the earth. Whereas the line of sight is the straight line perpendicular to the plumb line at the telescope. Refer standard books on Surveying under the topic "Curvature and Refraction" for more details.

Level Vs Horizontal line

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