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10 Cards in this Set
- Front
- Back
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Whats is a level line?
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A line lying in a level surface and is therefore normal to the direction of gravity.
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What is a datum surface?
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An adopted level surface to which the elevations of point can be referred.
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What is a reduced level?
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A reduced level of a point is its elevation about the datum adopted.
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What is a Bench Mark?
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A stable reference point, the reduced level of which has been determined by precise leveling.
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How do you calculate the loss in height during leveling?
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Backsight minus foresight. Remember: the smaller the staff reading the higher the elevation.
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Why should the level be set up half way between leveling points?
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To minimise error, or at least to ensure that the error is applied equally across the points.
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Why is a bench mark or known RL required during leveling?
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Otherwise the elevation of the points is not known, only the change in elevation between points
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What are some factors that reduce the distance between level and staff?
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Heat shimmer (hard to read), large changes in elevation (staff too high or low), visual error.
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What is a change point?
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A point where the staff holder remains in position and the instrument (level) is moved.
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Are backsight (BS) and FS recorded on different lines in a level book?
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Readings from the same staff point are recorded on the SAME line in a leveling book.
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