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it is line set out by the optical axis of the instrument ( level). so it is just an imaginary line that describes the ray of light that allowes us to read different values from the leveling staff. this term arose from the fact that in differential leveling in surveying we must construct horizontal line of sight, but due to collimation error the collimation line (i.e. line of sight) will not be 100% horizontal (by horizontal we mean tangent the level surface at the instrument position), instead it will be slightly deviated. so what we are looking to achieve when we eliminate the collimation error (using the 2 peg test) is a horizontal line of collimation.
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What is the function of spade?
to levelling the soil.
What would be the cost of labor for 464 square feet?
The answer will depend on what is required for the 464 sq feet: painting it, concreting it, tiling it, levelling it, etc.
What is a line that is not a line but is almost a line?
A line of best-fit.
What could be a name of a line?
A straight line, a telephone line, a shipping line, a fishing line.
What is line intersect?
A line intersect is a point on a line where another line or object crosses the line.
