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3 cards from this section. Quick, good the night before a test.
What is Reduced Level (R.L.)?
Think of the reference point as sea level.
Define angle of depression.
Consider when you're looking down from a height.
What is the primary function of the tangent in surveying?
Consider its role in SOHCAHTOA.
True or False: Curvature correction is not necessary in short distances.
Think about how curvature affects large spans.
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.
Don't forget to consider both mixture of measurements—height and curvature.
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?
Think about how elevation changes affect overall calculations.
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