1.15. Measurement of Levels

Try these first

1. 1.

   Define levelling in surveying.

   Hint

   Think about what measuring height means in that context.

2. 2.

   What does BM stand for in levelling?

   Hint

   Consider the reference point's importance in measurements.

3. 3.

   What is the primary purpose of levelling?

   • To measure horizontal distances
   • To determine elevation of points
   • To plot maps

   Hint

   Think about the relationship between different elevations.

4. 4.

   True or False: Mean Sea Level is a reference used in some levelling work.

   • True
   • False

   Hint

   Recall the definitions we've discussed.

5. 5.

   If a bench mark is at 150m and a back sight reading from the BM is 1.2m, how would you calculate the reduced level of a point with a fore sight reading of 0.8m?

   Hint

   Use the formula for the Height of Instrument and back calculate.

6. 6.

   You take a series of staff readings: BS = 1.6m, FS = 0.9m. What is the rise or fall? Following that, if you had another reading: BS = 2.0m, FS = 1.5m, how would you summarize the level changes?

   Hint

   Make sure you keep track of each change in a journal; it will help in visualizing your data.