1. CHAPTER 1: Introduction to Levelling

1.1. 1.1 What is Levelling?

 * Definition: Levelling is a branch of surveying that deals with the measurement of vertical distances to determine the relative heights or elevations of points on or above the Earth's surface.
 * It's about finding out how high or low one point is compared to another.
 * Often refers to finding the difference in elevation between two points.