1.10. Example 1.28: R.L. Calculation of the Staff Station

Try these first

1. 1.

   What is Reduced Level (R.L.)?

   Hint

   Think of the reference point as sea level.

2. 2.

   Define angle of depression.

   Hint

   Consider when you're looking down from a height.

3. 3.

   What is the primary function of the tangent in surveying?

   • To calculate heights
   • To measure angles
   • To find distances

   Hint

   Consider its role in SOHCAHTOA.

4. 4.

   True or False: Curvature correction is not necessary in short distances.

   • True
   • False

   Hint

   Think about how curvature affects large spans.

5. 5.

   You set up your instrument at a height of 2.5 m, measure an angle of depression of 10° to a staff at a distance of 2000 m. Apply curvature correction and find the R.L.

   Hint

   Don't forget to consider both mixture of measurements—height and curvature.

6. 6.

   If the elevation of the instrument is decreased by 1 m, how does this affect the R.L. of the measurement taken at the same distance and angle of depression?

   Hint

   Think about how elevation changes affect overall calculations.