The Surveyor's Calculator contains useful formulas for height(h) by drop time calculating ranges (a) and elevations (Y) based on measurable observations (`theta_1, theta_2,` and x). It provides a height estimate (h) base on time of a vertical drop, and it also provides a simple Interpolation (linear) calculation.
Additional formulas could be easily Linear Interpolation added to this calculator. Please feel free to make suggestions by adding comments below.