How this calculation works
Find height from two stations aligned on one side of the object.
THE FORMULA
h=D tan A tan B/(tan A−tan B)A worked example
Stations 30 apart with slopes 1 and 1/2 give height 30.
Good to know
Station instruments must be at the same elevation.
Reference: OpenStax Algebra and Trigonometry (opens in a new tab) ↗
Read the result
Find height from two stations aligned on one side of the object.
The primary result is labeled “Height above instrument level”. Keep the input definitions in view when comparing this result with another method.
Try a related calculation
Station instruments must be at the same elevation.
For a related exercise, try the quadratic equation solver.
A few questions, answered
How can I check the default inputs by hand?
Stations 30 apart with slopes 1 and 1/2 give height 30.
Which rule does this calculator apply?
h=D tan A tan B/(tan A−tan B)