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Which of the following is the INCORRECT correction to be applied while determining the difference in elevation between two points, when the observations are from only one point?
- a)Axis signal correction
- b)Correction for sag
- c)Correction for curvature
- d)Correction for refraction
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is the INCORRECT correction to be applied while...
Correction for sag:
The correction for sag is used when determining the difference in elevation between two points from only one observation point. This correction accounts for the sag in the line of sight caused by the weight of the line connecting the two points.
Explanation:
- When making observations over long distances, the weight of the line can cause it to sag slightly, leading to inaccuracies in the measurements.
- The correction for sag helps to compensate for this sag in the line of sight, ensuring more accurate elevation differences between the two points.
- By applying the correction for sag, the measurements can be adjusted to reflect the true elevation difference between the two points, accounting for any errors introduced by the sag in the line.
In conclusion, the correction for sag is a necessary adjustment to consider when determining elevation differences between two points from only one observation point, helping to improve the accuracy of the measurements.
The correction for sag is used when determining the difference in elevation between two points from only one observation point. This correction accounts for the sag in the line of sight caused by the weight of the line connecting the two points.
Explanation:
- When making observations over long distances, the weight of the line can cause it to sag slightly, leading to inaccuracies in the measurements.
- The correction for sag helps to compensate for this sag in the line of sight, ensuring more accurate elevation differences between the two points.
- By applying the correction for sag, the measurements can be adjusted to reflect the true elevation difference between the two points, accounting for any errors introduced by the sag in the line.
In conclusion, the correction for sag is a necessary adjustment to consider when determining elevation differences between two points from only one observation point, helping to improve the accuracy of the measurements.
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Which of the following is the INCORRECT correction to be applied while...
The following corrections are to be applied while determining the difference in elevation between two points when the observations are from only one point:
- Axis signal correction
- In order to observe the points from the theodolite station, signals of appropriate heights are erected at the points to be observed. The signal may or may not be the same height as that of the instrument.
- If the height of the signal is not the same as that of the height of the instrument axis above the station, a correction known as the axis signal correction or eye and object correction is applied
- Correction for curvature
- Earth has actually a curved surface which is assumed to be a level surface for simplification in the surveying. So the level line between the stations is not horizontal in real conditions but the line of sight by the leveling instrument is horizontal.
- The vertical distance between the horizontal line and the level line denotes the effect of the curvature of the earth. The correction applied to counter this error is curvature correction
- Correction for refraction
- The rays of light passing through the atmosphere of different densities bend down. It results in this type of correction.
- The effect of refraction is 1/7th time the curvature correction but is of the opposite nature. Hence the correction for refraction is additive to the staff reading.
Hence, Correction for sag is the incorrect correction to be applied while determining the difference in elevation between two points, when the observations are from only one point.
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Which of the following is the INCORRECT correction to be applied while determining the difference in elevation between two points, when the observations are from only one point?a)Axis signal correctionb)Correction for sagc)Correction for curvatured)Correction for refractionCorrect answer is option 'B'. Can you explain this answer?
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