1.15.6.c. Fly levelling

Try these first

1. 1.

   Define what a benchmark is in surveying.

   Hint

   Think about what we use as a standard reference in measurements.

2. 2.

   What does a back sight reading represent?

   Hint

   Remember the sequence in which we take readings.

3. 3.

   What is the purpose of fly levelling?

   • To take readings from a fixed benchmark only.
   • To connect survey sites to distant benchmarks.
   • To establish permanent benchmarks.

   Hint

   Reflect on the need for distant connections in surveying.

4. 4.

   True or False: Fly levelling needs to establish a temporary benchmark at the survey site.

   • True
   • False

   Hint

   Think about what occurs at the survey site.

5. 5.

   A surveyor is tasked with fly levelling a new area where no benchmarks exist nearby. Describe the steps they would follow from the beginning to establish temporary benchmarks.

   Hint

   Think about each individual step taken and what readings indicate.

6. 6.

   In a fly levelling operation, the surveyor measures elevations that seem inconsistent. What might cause these discrepancies, and how could they address them?

   Hint

   Reflect on both equipment and technique as factors of accuracy.